Audizine - An Automotive Enthusiast Community

Page 1 of 2 12 LastLast
Results 1 to 40 of 51
  1. #1
    Active Member One Ring EtienneChollet's Avatar
    Join Date
    Aug 14 2016
    AZ Member #
    378501
    My Garage
    2006 volkswagen passat
    Location
    Connecticut

    Talking Rookie performance Upgrades

    Guest-only advertisement. Register or Log In now!
    Whats up guys i just bought a 2007 audi b7, so far i have installed a cheap short ram intake and a fuel pressure regulator and have not tuned the car yet. By the way, the SRI sounds amazing and makes the car go soon fast its insane lol i feel like a kid on christmas. Anyways, back to the point, what are the first upgrades i should do performance wise to my car. i love working on it, the intake was a breeze to install and I'm not a mechanic or anything like it. just looking for some easyish upgrades to the performance

  2. #2
    Veteran Member Four Rings aluthman's Avatar
    Join Date
    Mar 24 2013
    AZ Member #
    111961
    Location
    Oakdale, CT

    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  3. #3
    Veteran Member Four Rings QuattriumMT6's Avatar
    Join Date
    Aug 24 2013
    AZ Member #
    121666
    My Garage
    1991 Toyota Mr2 Turbo
    Location
    Stockton, CA

    Quote Originally Posted by EtienneChollet View Post
    Whats up guys i just bought a 2007 audi b7, so far i have installed a cheap short ram intake and a fuel pressure regulator and have not tuned the car yet. By the way, the SRI sounds amazing and makes the car go soon fast its insane lol i feel like a kid on christmas. Anyways, back to the point, what are the first upgrades i should do performance wise to my car. i love working on it, the intake was a breeze to install and I'm not a mechanic or anything like it. just looking for some easyish upgrades to the performance
    First off...Welcome to the boards! Glad the intake gives you the go fast placebo effect. Unfortunately it adds an amazing 1-2hp at most. A tune would be your best upgrade that you'll actually feel. Aside that make sure you're preventative maintenance is all squared away otherwise you won't be able to enjoy any upgrade you throw at it.

  4. #4
    Active Member One Ring EtienneChollet's Avatar
    Join Date
    Aug 14 2016
    AZ Member #
    378501
    My Garage
    2006 volkswagen passat
    Location
    Connecticut

    Thanks man will do hahaha i just got a 100,000 mile service and am changing my oil every 3000 miles to keep everything always fresh

    - - - Updated - - -

    what

    - - - Updated - - -

    that what was to aluthman

  5. #5
    Veteran Member Four Rings adam044's Avatar
    Join Date
    Oct 31 2014
    AZ Member #
    292167
    My Garage
    2024 Jeep Wrangler Unlimited
    Location
    NH

    Quote Originally Posted by aluthman View Post
    My thoughts exactly.


    Get the timing belt done if it hasn't been done already.
    2019 Audi RS3 - Black Mythos Metallic

    2014 Audi S4 - 6MT
    2008 Audi A4 S-Line Titanium
    2000 Audi A4

  6. #6
    Veteran Member Four Rings aluthman's Avatar
    Join Date
    Mar 24 2013
    AZ Member #
    111961
    Location
    Oakdale, CT

    What part of CT?
    -Adam

    '07 DTM A4 2.0T|6MT|EFR 7163 Twin Scroll|DoTuning|Built Motor|Meth and other go fast stuff…
    '06 A4 2.0T Quattro - RIP (Best ¼ mile pass 13.634 @ 103.30)

  7. #7
    Veteran Member Four Rings vce1232000's Avatar
    Join Date
    Jun 17 2013
    AZ Member #
    117368
    My Garage
    83 MK1 GTI Callaway Turbo stg II
    Location
    jersey city nj

    Quote Originally Posted by aluthman View Post
    lol..............
    APR KO4, APR HPFP,RS4 LPFP Cntr,145 bar PRV, APR TP, TT DP, GFB DV+, AWE FMIC, BFI CC, AWE Exhaust, RS4 Exh tips, ST CO, 034 RSB,034 St Dnsty Mtr Mts, New Sth West Bst guage, B7 RS4 8 pot Calipers.Goodridge SS brake lines frt & rr. Hawk HPS frt & rr. RS4 PS rack, RS4 Servotronic Relay,RS4 rims. S4 mirror caps,DTM frt bmpr and rs4 fogs,LED tail lites
    S4 Recaro Front & Rear seats. Led Interior Kit,United LED's fog lites
    2007 A4 Avant 2.0T Tiptronic 6spd

  8. #8
    Established Member Two Rings shahk62's Avatar
    Join Date
    Jul 14 2015
    AZ Member #
    342413
    Location
    Sydney

    Rookie performance Upgrades

    Rear away with end links is a great bang for buck upgrade to handling. Either get an 034 or a used rs4 bar with upgraded end links and feel the difference.
    My personal favourite easy and cheap upgrade was the Go fast bits DV+. With your intake I'm sure you'll enjoy the better boost response and sound

    Another great thing to do early on is the mounts (snub, trans, rear diff, engine). They are relatively easy to change out (especially the snub) and give you a more direct feel


    Sent from my iPhone using Tapatalk
    2005.5 B7 A4 2.0T Quattro - 034 RSB + End links, GFB DV+, 034 Snub, 034 Billet Rear Diff Carrier Mounts, BSR CAI

  9. #9
    Senior Member Three Rings wriscolf's Avatar
    Join Date
    Jul 10 2016
    AZ Member #
    376087
    My Garage
    1993 Nissan 240sx Convertible with Silvia Front
    Location
    NYC

    I agree with that has been said here. I would knockout all the maintance stuff before anything. You dont want to snap anything. So things like timing belt and such. Oil Change at 3k is a bit aggressive for fully synthetic oil in my opinion. I use royal purple oil so 3k would become quite pricey and pointless since its such a good oil, minimal breakdown and such. We are both on the same boat but i do have a tune. I have APR tune and when i first drove my car around it was on stock mode which was fun but nothing compared to my 93 octane stage one mode. Car is a lot faster and enjoyable. Its a night and day difference. My next upgrade is going to be a DV+ once i iron out some of the kinks the car has now.

    Welcome aboard and wish you good luck on your car.
    2007 Audi A4 S-Line Titanium Edition/Phantom Black/Magnaflow Exhaust/APR Stage 1/APR Carbonio Intake/Lots of Headaches/

  10. #10
    Active Member One Ring EtienneChollet's Avatar
    Join Date
    Aug 14 2016
    AZ Member #
    378501
    My Garage
    2006 volkswagen passat
    Location
    Connecticut

    Quote Originally Posted by aluthman View Post
    What part of CT?
    I live in trumbull right next to Fairfield

  11. #11
    Established Member Two Rings L'Audi's Avatar
    Join Date
    Apr 06 2016
    AZ Member #
    371402
    Location
    Long Island, NY

    06 Dolphin Gray tip 2.0T
    GIAC Xplus | USP Testpipe | RevMotoring Springs | 19X8.5/9.5 Niche Targa | pioneer 80PRS | Taramp's HD1200, HD8000, HD10000 | 18-Sound 6's | B&C 8's | Audiocontrol Three.1, Audiocontrol Epicenter | Clarion EQS746, MCD360

  12. #12
    Veteran Member Four Rings canadianA4B7's Avatar
    Join Date
    Feb 10 2012
    AZ Member #
    87997
    My Garage
    parts
    Location
    Napanee, ON

    Quote Originally Posted by L'Audi View Post
    Someone cat mat have coughed that thing up? What is it?

  13. #13
    Veteran Member Four Rings pezgoon's Avatar
    Join Date
    Jul 25 2016
    AZ Member #
    377164
    Location
    new hampshire

    Pomeranian?
    Eric

    2005.5 6mt A4 2.0 94k miles
    2010 Q5 3.2L 6at 160k miles

  14. #14
    Established Member Two Rings L'Audi's Avatar
    Join Date
    Apr 06 2016
    AZ Member #
    371402
    Location
    Long Island, NY

    Quote Originally Posted by pezgoon View Post
    Pomeranian?
    Correct. Not mine btw, posted because dog-thread.
    06 Dolphin Gray tip 2.0T
    GIAC Xplus | USP Testpipe | RevMotoring Springs | 19X8.5/9.5 Niche Targa | pioneer 80PRS | Taramp's HD1200, HD8000, HD10000 | 18-Sound 6's | B&C 8's | Audiocontrol Three.1, Audiocontrol Epicenter | Clarion EQS746, MCD360

  15. #15
    Veteran Member Four Rings derrek's Avatar
    Join Date
    Jul 23 2010
    AZ Member #
    61809
    Location
    arizona

    So dog thread?








    Quote Originally Posted by shahk62 View Post
    Rear away with end links is a great bang for buck upgrade to handling. Either get an 034 or a used rs4 bar with upgraded end links and feel the difference.
    My personal favourite easy and cheap upgrade was the Go fast bits DV+. With your intake I'm sure you'll enjoy the better boost response and sound

    Another great thing to do early on is the mounts (snub, trans, rear diff, engine). They are relatively easy to change out (especially the snub) and give you a more direct feel


    Sent from my iPhone using Tapatalk
    Quote Originally Posted by wriscolf View Post
    I agree with that has been said here. I would knockout all the maintance stuff before anything. You dont want to snap anything. So things like timing belt and such. Oil Change at 3k is a bit aggressive for fully synthetic oil in my opinion. I use royal purple oil so 3k would become quite pricey and pointless since its such a good oil, minimal breakdown and such. We are both on the same boat but i do have a tune. I have APR tune and when i first drove my car around it was on stock mode which was fun but nothing compared to my 93 octane stage one mode. Car is a lot faster and enjoyable. Its a night and day difference. My next upgrade is going to be a DV+ once i iron out some of the kinks the car has now.

    Welcome aboard and wish you good luck on your car.
    You know the DV+ does nothing for you right


    Sent from my iPhone using Tapatalk

  16. #16
    Senior Member Three Rings wriscolf's Avatar
    Join Date
    Jul 10 2016
    AZ Member #
    376087
    My Garage
    1993 Nissan 240sx Convertible with Silvia Front
    Location
    NYC

    Quote Originally Posted by derrek View Post
    You know the DV+ does nothing for you right
    Sent from my iPhone using Tapatalk
    Really? I thought it makes it more reliable on the boost. Meaning if there is any damage or what not. No need to change as often. Can you tell me what you mean?
    2007 Audi A4 S-Line Titanium Edition/Phantom Black/Magnaflow Exhaust/APR Stage 1/APR Carbonio Intake/Lots of Headaches/

  17. #17
    Stage 2 Banner Advertiser Four Rings Hugh@EuropaParts's Avatar
    Join Date
    Aug 22 2010
    AZ Member #
    63043
    Location
    Piscataway, NJ

    Quote Originally Posted by wriscolf View Post
    Really? I thought it makes it more reliable on the boost. Meaning if there is any damage or what not. No need to change as often. Can you tell me what you mean?
    Rev D is all you need... anything else is a waste of money because you're not actually gaining anything other than another sig addition.
    Hugh
    EuropaParts.com, Your Trusted Audi Parts Source
    Facebook: Like Us on Facebook
    Instagram: Follow Us on Instagram




  18. #18
    Veteran Member Four Rings derrek's Avatar
    Join Date
    Jul 23 2010
    AZ Member #
    61809
    Location
    arizona

    Quote Originally Posted by wriscolf View Post
    Really? I thought it makes it more reliable on the boost. Meaning if there is any damage or what not. No need to change as often. Can you tell me what you mean?
    It converts the updated revision D DV to the a diaphragm style like the first revision but they charge you a bunch of money to do it.


    Sent from my iPhone using Tapatalk

  19. #19
    Senior Member Three Rings wriscolf's Avatar
    Join Date
    Jul 10 2016
    AZ Member #
    376087
    My Garage
    1993 Nissan 240sx Convertible with Silvia Front
    Location
    NYC

    Quote Originally Posted by Hugh@EuropaParts View Post
    Rev D is all you need... anything else is a waste of money because you're not actually gaining anything other than another sig addition.
    Quote Originally Posted by derrek View Post
    It converts the updated revision D DV to the a diaphragm style like the first revision but they charge you a bunch of money to do it.


    Sent from my iPhone using Tapatalk
    How would i know which revision i have?
    2007 Audi A4 S-Line Titanium Edition/Phantom Black/Magnaflow Exhaust/APR Stage 1/APR Carbonio Intake/Lots of Headaches/

  20. #20
    Veteran Member Four Rings derrek's Avatar
    Join Date
    Jul 23 2010
    AZ Member #
    61809
    Location
    arizona

    Look at the part number on your DV


    Sent from my iPhone using Tapatalk

  21. #21
    Veteran Member Four Rings Charles.waite's Avatar
    Join Date
    Jun 27 2011
    AZ Member #
    77478
    Location
    Seattle, WA

    Rookie performance Upgrades

    Quote Originally Posted by derrek View Post
    You know the DV+ does nothing for you right
    Thou shalt not utter such words on this forum lest you intend to rustle many jimmies and cause much butthurt and consternation. But yes, the only way it does anything meaningful is if there is something wrong with your current DV. I've heard rumors that the Rev D valves are leaky, but those are simply rumors, nobody has presented any evidence to confirm it.


    OP, I'd love to know more about that upgraded FPR you have and how it works with an untuned car................



    Also:



    Skeptical Golden is skeptical.
    -CP
    2008 2.0t S-Line Ti 6MT Avant
    2017 Q7 3.0t
    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  22. #22
    Veteran Member Four Rings vce1232000's Avatar
    Join Date
    Jun 17 2013
    AZ Member #
    117368
    My Garage
    83 MK1 GTI Callaway Turbo stg II
    Location
    jersey city nj

    A red "T" behind the 2.0 on car will yield you an +50hp.........
    APR KO4, APR HPFP,RS4 LPFP Cntr,145 bar PRV, APR TP, TT DP, GFB DV+, AWE FMIC, BFI CC, AWE Exhaust, RS4 Exh tips, ST CO, 034 RSB,034 St Dnsty Mtr Mts, New Sth West Bst guage, B7 RS4 8 pot Calipers.Goodridge SS brake lines frt & rr. Hawk HPS frt & rr. RS4 PS rack, RS4 Servotronic Relay,RS4 rims. S4 mirror caps,DTM frt bmpr and rs4 fogs,LED tail lites
    S4 Recaro Front & Rear seats. Led Interior Kit,United LED's fog lites
    2007 A4 Avant 2.0T Tiptronic 6spd

  23. #23
    Veteran Member Four Rings Charles.waite's Avatar
    Join Date
    Jun 27 2011
    AZ Member #
    77478
    Location
    Seattle, WA

    Quote Originally Posted by vce1232000 View Post
    A red "T" behind the 2.0 on car will yield you an +50hp.........
    Bro stop spilling the beans! Gotta keep that mod on the DL!
    -CP
    2008 2.0t S-Line Ti 6MT Avant
    2017 Q7 3.0t
    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  24. #24
    Veteran Member Four Rings pezgoon's Avatar
    Join Date
    Jul 25 2016
    AZ Member #
    377164
    Location
    new hampshire

    Quote Originally Posted by Charles.waite View Post
    Bro stop spilling the beans! Gotta keep that mod on the DL!
    How many does the windshield tint area turbo sticker award?
    Eric

    2005.5 6mt A4 2.0 94k miles
    2010 Q5 3.2L 6at 160k miles

  25. #25
    Veteran Member Four Rings derrek's Avatar
    Join Date
    Jul 23 2010
    AZ Member #
    61809
    Location
    arizona

    Rookie performance Upgrades





    Sent from my iPhone using Tapatalk

  26. #26
    Deactivated Four Rings
    Join Date
    Jun 23 2011
    AZ Member #
    77278
    Location
    CT

    Quote Originally Posted by Hugh@EuropaParts View Post
    Rev D is all you need... anything else is a waste of money because you're not actually gaining anything other than another sig addition.
    So true, I probably have close to 200k on my Rev D.

  27. #27
    Stage 2 Banner Advertiser Four Rings Hugh@EuropaParts's Avatar
    Join Date
    Aug 22 2010
    AZ Member #
    63043
    Location
    Piscataway, NJ

    Quote Originally Posted by Chris@EPL View Post
    So true, I probably have close to 200k on my Rev D.
    They've done studies, you know. 60% of the time, it works every time.
    Hugh
    EuropaParts.com, Your Trusted Audi Parts Source
    Facebook: Like Us on Facebook
    Instagram: Follow Us on Instagram




  28. #28
    Veteran Member Four Rings Charles.waite's Avatar
    Join Date
    Jun 27 2011
    AZ Member #
    77478
    Location
    Seattle, WA

    Rookie performance Upgrades

    Wait.... So you're saying a fancy silicon gasket/plunger thingy isn't going to add 100hp to my stock 2.0t?? Lies!!!
    -CP
    2008 2.0t S-Line Ti 6MT Avant
    2017 Q7 3.0t
    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  29. #29
    Veteran Member Four Rings derrek's Avatar
    Join Date
    Jul 23 2010
    AZ Member #
    61809
    Location
    arizona

    Quote Originally Posted by Charles.waite View Post
    Wait.... So you're saying a fancy silicon gasket/plunger thingy isn't going to add 100hp to my stock 2.0t?? Lies!!!
    It adds 150hp




    Sent from my iPhone using Tapatalk

  30. #30
    Veteran Member Four Rings QuattriumMT6's Avatar
    Join Date
    Aug 24 2013
    AZ Member #
    121666
    My Garage
    1991 Toyota Mr2 Turbo
    Location
    Stockton, CA

    I love these underwater GoPro shots!!!

  31. #31
    Veteran Member Four Rings Charles.waite's Avatar
    Join Date
    Jun 27 2011
    AZ Member #
    77478
    Location
    Seattle, WA

    Quote Originally Posted by derrek View Post
    It adds 150hp




    Sent from my iPhone using Tapatalk
    That could seriously be my golden. What a freaking bozo.
    -CP
    2008 2.0t S-Line Ti 6MT Avant
    2017 Q7 3.0t
    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  32. #32
    Veteran Member Four Rings vce1232000's Avatar
    Join Date
    Jun 17 2013
    AZ Member #
    117368
    My Garage
    83 MK1 GTI Callaway Turbo stg II
    Location
    jersey city nj

    Quote Originally Posted by pezgoon View Post
    How many does the windshield tint area turbo sticker award?
    It depends on what color "turbo" sticker it is
    APR KO4, APR HPFP,RS4 LPFP Cntr,145 bar PRV, APR TP, TT DP, GFB DV+, AWE FMIC, BFI CC, AWE Exhaust, RS4 Exh tips, ST CO, 034 RSB,034 St Dnsty Mtr Mts, New Sth West Bst guage, B7 RS4 8 pot Calipers.Goodridge SS brake lines frt & rr. Hawk HPS frt & rr. RS4 PS rack, RS4 Servotronic Relay,RS4 rims. S4 mirror caps,DTM frt bmpr and rs4 fogs,LED tail lites
    S4 Recaro Front & Rear seats. Led Interior Kit,United LED's fog lites
    2007 A4 Avant 2.0T Tiptronic 6spd

  33. #33
    Veteran Member Four Rings adam044's Avatar
    Join Date
    Oct 31 2014
    AZ Member #
    292167
    My Garage
    2024 Jeep Wrangler Unlimited
    Location
    NH

    2019 Audi RS3 - Black Mythos Metallic

    2014 Audi S4 - 6MT
    2008 Audi A4 S-Line Titanium
    2000 Audi A4

  34. #34
    Veteran Member Four Rings pezgoon's Avatar
    Join Date
    Jul 25 2016
    AZ Member #
    377164
    Location
    new hampshire

    Quote Originally Posted by vce1232000 View Post
    It depends on what color "turbo" sticker it is
    Pink. Is another color offered?
    Eric

    2005.5 6mt A4 2.0 94k miles
    2010 Q5 3.2L 6at 160k miles

  35. #35
    Veteran Member Four Rings vce1232000's Avatar
    Join Date
    Jun 17 2013
    AZ Member #
    117368
    My Garage
    83 MK1 GTI Callaway Turbo stg II
    Location
    jersey city nj

    Quote Originally Posted by pezgoon View Post
    Pink. Is another color offered?
    Sorry that only yields you +10hp
    APR KO4, APR HPFP,RS4 LPFP Cntr,145 bar PRV, APR TP, TT DP, GFB DV+, AWE FMIC, BFI CC, AWE Exhaust, RS4 Exh tips, ST CO, 034 RSB,034 St Dnsty Mtr Mts, New Sth West Bst guage, B7 RS4 8 pot Calipers.Goodridge SS brake lines frt & rr. Hawk HPS frt & rr. RS4 PS rack, RS4 Servotronic Relay,RS4 rims. S4 mirror caps,DTM frt bmpr and rs4 fogs,LED tail lites
    S4 Recaro Front & Rear seats. Led Interior Kit,United LED's fog lites
    2007 A4 Avant 2.0T Tiptronic 6spd

  36. #36
    Veteran Member Four Rings pezgoon's Avatar
    Join Date
    Jul 25 2016
    AZ Member #
    377164
    Location
    new hampshire

    Damn. Lololol
    Eric

    2005.5 6mt A4 2.0 94k miles
    2010 Q5 3.2L 6at 160k miles

  37. #37
    Veteran Member Four Rings derrek's Avatar
    Join Date
    Jul 23 2010
    AZ Member #
    61809
    Location
    arizona





    Sent from my iPhone using Tapatalk

  38. #38
    Veteran Member Four Rings b7_Andy's Avatar
    Join Date
    Jul 18 2015
    AZ Member #
    343342
    My Garage
    Scrap Transmissions!
    Location
    Denver, CO

    Just killin the game with these under water shots!

  39. #39
    Veteran Member Four Rings Audi_509's Avatar
    Join Date
    May 20 2010
    AZ Member #
    59269
    My Garage
    2008 A4-sold. 2019 A5-sold,: '23 S5
    Location
    WA


  40. #40
    Veteran Member Four Rings Charles.waite's Avatar
    Join Date
    Jun 27 2011
    AZ Member #
    77478
    Location
    Seattle, WA

    Not underwater but sort of submerged in a bush I guess...

    -CP
    2008 2.0t S-Line Ti 6MT Avant
    2017 Q7 3.0t
    SOLD -- 2012 Q5 2.0t - Stock Mommy Missile with new timing chains
    Former USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


    © 2001-2024 Audizine, Audizine.com, and Driverzines.com
    Audizine is an independently owned and operated automotive enthusiast community and news website.
    Audi and the Audi logo(s) are copyright/trademark Audi AG. Audizine is not endorsed by or affiliated with Audi AG.