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Forum: C4 & C5 Tech

All C4 and C5-related FAQ, DIY, Spec Sheets, and must-read threads compiled into one location. Discussion between our Active Members and above, but viewable by all.

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  1. For the extended discussion of previous, current, and ongoing C4 and C5 platform A6, S6, RS 6, and allroad projects and builds.

    Forum Actions:

    Forum Statistics:

    • Threads: 56
    • Posts: 4,795
  1. Sticky Thread Sticky: 01e swap parts thread

    Started by Widebody4.2, 09-19-2013 08:13 PM
    2 Pages
    1 2
    • Replies: 58
    • Views: 47,942
    11-06-2014, 10:51 PM Go to last post
  2. Post Sticky Thread Sticky: C5 A6 Part Numbers List : All Submodels

    Started by Deep6ed, 04-22-2010 07:10 AM
    c5 a6 part number
    • Replies: 6
    • Views: 29,435
    12-11-2013, 09:47 AM Go to last post
  3. Exclamation Sticky Thread Sticky: DIY: How to submit your own FAQ/DIY write-up.

    Started by Admin, 07-31-2010 06:49 PM
    diy article, faw article, how-to, spec sheet, submit, write-up
    • Replies: 0
    • Views: 13,792
    07-31-2010, 06:49 PM Go to last post
    • Replies: 24
    • Views: 23,626
    04-13-2010, 09:19 PM Go to last post
  4. Sticky Thread Sticky: Everything you want to know about Bosch Diverter Valves.

    Started by ccomengee86, 04-12-2010 09:42 PM
    • Replies: 1
    • Views: 40,702
    04-13-2010, 02:50 PM Go to last post
    • Replies: 3
    • Views: 21,448
    04-17-2023, 11:58 AM Go to last post
  1. DIY: C5 A6 LED City Light Mod

    Started by Vinchenzo51, 09-02-2010 09:40 PM
    • Replies: 4
    • Views: 22,234
    06-19-2019, 05:46 AM Go to last post
  2. Lightbulb DIY: Checking your heated steering wheel

    Started by audifirst, 04-30-2012 08:01 AM
    element, heating, in steering wheel
    • Replies: 5
    • Views: 23,287
    06-10-2019, 12:59 PM Go to last post
  3. FAQ: Differences in 2.7T engines

    Started by vtraudt, 01-06-2012 12:57 PM
    • Replies: 3
    • Views: 27,200
    04-26-2016, 11:42 PM Go to last post
    • Replies: 1
    • Views: 13,645
    10-12-2013, 11:04 AM Go to last post
    • Replies: 0
    • Views: 7,541
    05-11-2013, 08:46 AM Go to last post
  4. Post DIY: DIY: Parking light Conversion Mod

    Started by audifirst, 05-01-2013 10:59 PM
    hardwire, parking light
    • Replies: 0
    • Views: 13,257
    05-01-2013, 10:59 PM Go to last post
  5. DIY: Rear brake caliper service

    Started by Hambone101, 01-26-2013 11:05 AM
    • Replies: 0
    • Views: 13,715
    01-26-2013, 11:05 AM Go to last post
    • Replies: 1
    • Views: 41,527
    01-10-2013, 10:12 AM Go to last post
  6. DIY : allroad RS6 grill to match lowers

    Started by blkrhyno, 09-26-2012 10:08 PM
    • Replies: 3
    • Views: 16,430
    12-05-2012, 03:39 PM Go to last post
  7. DIY: C5 Quad Xenon with mini D2S projectors

    Started by mike's machine, 11-09-2011 07:30 AM
    • Replies: 3
    • Views: 14,657
    07-14-2012, 11:10 PM Go to last post
  8. Post DIY: DIY: How to replace Fuel Filter in Audi A6 C5 Series

    Started by audifirst, 06-04-2012 09:30 AM
    fuel filter audi
    • Replies: 0
    • Views: 50,712
    06-04-2012, 09:30 AM Go to last post
    • Replies: 1
    • Views: 14,060
    05-27-2012, 08:34 PM Go to last post
    • Replies: 0
    • Views: 8,067
    04-14-2012, 04:44 PM Go to last post
  9. DIY: Custom CAI 2.7

    Started by TwinTurboYacht, 03-07-2012 02:23 PM
    • Replies: 1
    • Views: 11,229
    03-15-2012, 04:11 PM Go to last post
    • Replies: 1
    • Views: 8,463
    03-14-2012, 09:15 PM Go to last post
  10. DIY: How to remove rear bumper cover in Audi A6 Sedan

    Started by audifirst, 01-30-2012 05:30 PM
    audi a6 rear bumper.
    • Replies: 1
    • Views: 45,049
    02-04-2012, 09:20 AM Go to last post
  11. DIY: Bilstein strut washers vs. OEM

    Started by mtxsho93, 12-11-2011 03:13 PM
    • Replies: 0
    • Views: 7,565
    12-11-2011, 03:13 PM Go to last post
    • Replies: 2
    • Views: 71,965
    10-15-2011, 08:52 PM Go to last post
    • Replies: 1
    • Views: 12,526
    10-03-2011, 10:34 PM Go to last post
  12. DIY : Automatic power folding side mirrors

    Started by blkrhyno, 08-18-2011 09:38 PM
    • Replies: 1
    • Views: 36,709
    08-18-2011, 09:58 PM Go to last post
  13. DIY: front CV axle replacement

    Started by Gumby, 08-17-2011 11:34 PM
    • Replies: 1
    • Views: 40,209
    08-17-2011, 11:35 PM Go to last post
  14. DIY: Headlight restoration walk through

    Started by mithril, 08-05-2011 04:27 PM
    • Replies: 0
    • Views: 34,644
    08-05-2011, 04:27 PM Go to last post
  15. DIY: A6 2.7t 6spd transmission mount upgrade

    Started by estomax, 07-24-2011 11:28 AM
    • Replies: 0
    • Views: 20,378
    07-24-2011, 11:28 AM Go to last post
  16. DIY: c5 a6 2.7t front motor mounts

    Started by estomax, 07-17-2011 06:54 PM
    • Replies: 0
    • Views: 27,154
    07-17-2011, 06:54 PM Go to last post
  17. DIY: 4.2 Cam Position Sensor Removal/Replacement

    Started by beemercer, 07-10-2011 01:46 PM
    camshaft position, camshaft sensor
    • Replies: 0
    • Views: 11,034
    07-10-2011, 01:46 PM Go to last post
  18. DIY: Rear Differential Seal replacement

    Started by audifirst, 05-30-2011 09:48 AM
    • Replies: 0
    • Views: 55,015
    05-30-2011, 09:48 AM Go to last post
  19. Reference - Quick Shifter Trim Info (Pics)

    Started by Vinchenzo51, 05-15-2011 03:56 PM
    • Replies: 1
    • Views: 7,711
    05-15-2011, 08:07 PM Go to last post
    • Replies: 29
    • Views: 33,384
    04-13-2011, 05:17 PM Go to last post
  20. DIY: C5 allroad airspring replacement

    Started by skiroad'r, 06-17-2010 09:04 AM
    air spring, airspring, allroad, audi c5, diy
    • Replies: 1
    • Views: 16,885
    03-20-2011, 08:48 PM Go to last post
  21. DIY: ABS Module replacement in Audi A6

    Started by audifirst, 03-20-2011 10:27 AM
    abs problem, abs replacement
    • Replies: 0
    • Views: 54,781
    03-20-2011, 10:27 AM Go to last post
  22. DIY: 255mm s4 rear brake swap

    Started by Gumby, 03-20-2010 11:08 PM
    • Replies: 3
    • Views: 21,838
    01-16-2011, 09:21 PM Go to last post
  23. Moved: I'm doing conversion on my 2004 2.7t a6 to RS6

    Started by 2.7t steve, 10-21-2010 05:23 PM
    •  
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  24. Moved: Sway Bar Sizes: C5 chassis

    Started by PaperToast, 09-29-2010 01:58 PM
    •  
    •  
    • Replies: 0
    • Views: 22,030
    10-02-2010, 07:39 PM Go to last post
  25. DIY: 2.7T Oil Change

    Started by skiroad'r, 05-29-2010 07:21 AM
    2.7t oil change, allroad, b5 s4, c5 a6, diy oil change 2.7t
    • Replies: 1
    • Views: 34,722
    08-04-2010, 09:22 AM Go to last post
  26. DIY: Tiptronic fluid change

    Started by skiroad'r, 05-20-2010 09:51 AM
    allroad, c5 a6, diy, tiptronic, transmission service
    • Replies: 0
    • Views: 13,888
    05-20-2010, 09:51 AM Go to last post
  27. DIY: Sportec Lower Air Vent mod

    Started by ccomengee86, 04-12-2010 01:53 PM
    • Replies: 6
    • Views: 19,647
    05-07-2010, 06:20 PM Go to last post

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