Just a small preview for LOUD things to come...

[91gl]

Well I have been itching for straight pipes ever since i installed my cat-less Millteks. It was loud at first but I got used to it way to quick so I picked up a used AWE cat-back on the 'zine classifieds since i did not want to hack up my lovely FI CB. These are the end results. I probably will end up putting the AWE tips on but I'm not sure, I think i might just go raw pipe stylz

Please, I know i dont have cats, and soon muffler and it hurts the environment and/or disrupts the peace, but i just dont care. So any comments about that, please keep to yourselves.

Videos to come...

[PenguiN]

Siabani from audiworld had done this and he was complaining about losing a lot of low end power and torque... you need some back pressure to generate low end power.

[91gl]

Siabani from audiworld had done this and he was complaining about losing a lot of low end power and torque... you need some back pressure to generate low end power.

i understand, but you gain plenty in the top end and i am willing to lose that little bit of torque. plus, back pressure has more to do with piping diameter. rather than a couple of mufflers

[Monchichi8]

Post it up! Can't wait to hear this thing!Its going to be soo fucking loud!

[ZEUSROTTY]

i understand, but you gain plenty in the top end and i am willing to lose that little bit of torque. plus, back pressure has more to do with piping diameter. rather than a couple of mufflers

you will lose low end, andyou wont gain on top end at all... The Car is tuned for backpressure throughout the entire rev range. You will also burn out your O2 sensors quickly.
The point of low end is to get your heavy ass car moving faster so that the top end can take over. Its like having an unmodded civic, with a coffee can on the back... Ghey.

[intoblue]

Here is a sample of what an S4 sounds like with downpipes and no mufflers.
Take note of the yellow B7DTM.

http://www.youtube.com/watch?v=PjRijARL0oA

[bakos4]

You should just add some electric cutouts @ the mid pipe then you can turn it down when you need a break. You will def lose power low end and it will feel about the same up top, but you will sure get alot more attention.

[ALWAYS4UDI]

haha that's sick

[littleredwagen]

i vote for cherry bombs

[ziminskas]

Well I just put a couple of electric cutouts on my ride, and is pretty effective of catching people off guard. And its a great way to get rid of the little Honda Civics and the Mitsubishi Eclipse's at least from what I have observed when I open them up.

[91gl]

you will lose low end, andyou wont gain on top end at all... The Car is tuned for backpressure throughout the entire rev range. You will also burn out your O2 sensors quickly.
The point of low end is to get your heavy ass car moving faster so that the top end can take over. Its like having an unmodded civic, with a coffee can on the back... Ghey.

if only you had a clue what you were talking about and actually knew this from experience. when i removed the cats the car was an absolute monster above 5000 rpm's. when im already rolling and and blasting along/racing, im seldom under 5000 rpms so i doubt i need any low end there. plus the awe mufflers are straight through and act more like a big resonator than anything, so the only thing ghey here is you for spreading your non knowing BS to the world.

also, i have the VAST o2 spacers in there so i dont burn out my sensors. and any car will benefit from a non restrictive exhaust regardless the tune.

[91gl]

You should just add some electric cutouts @ the mid pipe then you can turn it down when you need a break. You will def lose power low end and it will feel about the same up top, but you will sure get alot more attention.

i dont like how the dumps open up under the car and make it vibrate and it just doesnt look right with two pipes out the back with no sound coming out of them.

[Justincredible]

I love it. your car already looks like it is running strong. You herd my exhaust so you know I'm all about it.

post up the clip when you got it together.

Any plans on getting back to the track with the new exhaust set up? That would be a great way to show if there is a performance loss or not

[91gl]

I love it. your car already looks like it is running strong. You herd my exhaust so you know I'm all about it.

post up the clip when you got it together.

Any plans on getting back to the track with the new exhaust set up? That would be a great way to show if there is a performance loss or not

car goes in on monday for install so ill have pics and my thoughts on it then. i wont be going back to the track until i get my clutch sorted out. i did a couple of hard 6500 launches and ended up glazing it so now it is not feeling that great.

[mystro]

Dude, release your inner rage. Holding things in will give you stress and hair loss.

[91gl]

Dude, release your inner rage. Holding things in will give you stress and hair loss.

Hahaha, I'm not an angry person, but I hate when people who have not a clue or experience with something talk smack.

[whartung]

Here is a sample of what an S4 sounds like with downpipes and no mufflers.
Take note of the yellow B7DTM.

http://www.youtube.com/watch?v=PjRijARL0oA

Not to jack the thread, but your yellow dtm sounds so nasty...

full labree?

[91gl]

Yea, I've been listening to that foe the past week. It's a labree with no mufflers. Sounds sick

[Das General]

Why would he blow his 02's? He isn't running leaded gas?

Back-pressure can be created with a simple bend.

Straight pipes sound amazing.

[cam]

sound clips or it didnt happen

[Ill 3.0]

badass, can't wait to hear sound clips

[91gl]

sound clips or it didnt happen

LMAO

just wait everyone. monday afternoon

[intoblue]

Not to jack the thread, but your yellow dtm sounds so nasty...

full labree?

Thanks. Yes it was a full Labree until i hacked those puppies off the ends and put straight pipes. It's like a peppermint patty everytime i start her up to the time i put her to bed. Hopefully going to get in on some supercharger action. Anyone............... looking for a beta test car in FL????????? LOL
Probably not, but still might go that route.

[b00st]

LMAO

just wait everyone. monday afternoon

do you have a dyno run for before? from my experience...you will lose low end and you won't gain any top end. the sound will compensate for what you think is top end. if you don't have a before and after dyno i would...then you'll probably see that it was a bad idea. this isn't old american muscle...the car is tuned with back pressure. sure removing the cats is the most restrictive part of the exhaust and having mufflers keeps some back pressure. i've seen plenty logged dyno runs of B6/B7 S4s with CB systems and what it yielded over stock. nobody has really gone open.

if your gonna do this i would do a before and after dyno. but its your ride...do as you see fit. its my opinion, from my experience, that you will lose and not gain anything on the high side either. i'd love to see otherwise...i'd don't think it will happen and the guy on AW is proof of that pudding but hey...you gotta do you what you gotta do. just like people who feel all the HP from a chip on these S4s.

[RAudi Driver]

9+1 Global Loser.

[2PUTT]

D,

it is Monday...people are waiting!!

[PenguiN]

i understand, but you gain plenty in the top end and i am willing to lose that little bit of torque. plus, back pressure has more to do with piping diameter. rather than a couple of mufflers

oh god... Not only do you lose A LOT of low end... you actually will end up losing top end as well... Do yourself a favor and dyno a before and after, then you can spend a heap of money reinstalling the stock exhaust. You will probably lose enough low end for it to be considerably noticeable and top end will be flat with a decrease in power. Your power band will be horrible. It will also sound like a lawnmower and will throw CEL. To each his own. Your car your money.

[91gl]

oh god... Not only do you lose A LOT of low end... you actually will end up losing top end as well... Do yourself a favor and dyno a before and after, then you can spend a heap of money reinstalling the stock exhaust. You will probably lose enough low end for it to be considerably noticeable and top end will be flat with a decrease in power. Your power band will be horrible. It will also sound like a lawnmower and will throw CEL. To each his own. Your car your money.

first off, i have the vast cel eliminators for each 02 sensor and i am at 5,000 cel free miles without the cats. anyways, update:

i drop off the car today and within a few hours i get a call to come pick it up. i get there and the one picking up his car asks me, "Is that your car?", I respond, "yes". He begins to laugh and goes, Have you ever heard a big block chevy with open header?" I respond, yes. He laughs again and goes, "well your car is just as loud." The guys there at the shop just kept laughing and calling me nuts.

And literally it was. Head pounding loud. I drove about 5 miles and turned right back. It sounded incredible, definetely not like a lawnmower It was just there was no way i could commute in this car everday without getting pulled over every couple of miles.

As for the little time i had it, I got to rip it a few times and really did not feel any loss in low end power but nothing really gained in the top. Felt about the same, just really loud.

So instead now, i had them put on my FI mufflers to the awe h-pipe non res. Still very loud, pretty close to the straights but something i could live with. i am not crazy about the tone of the h-pipe, sounds choppy. i am probably going to get an x-pipe put back in with some electronic dumps for when im feeling a little wild but that would probably be it. Ill get videos posted asap

[91gl]

9+1 Global Loser.

i dont get it

[Justincredible]

I switched from H to X it is hard to believe that there is a difference but the X gives you that back prussure the motor likes. It was a marked improvement for sure.

I had all 3

straight
H pipe
X pipe and the X gave a clear improvement in performance.

[91gl]

I switched from H to X it is hard to believe that there is a difference but the X gives you that back prussure the motor likes. It was a marked improvement for sure.

I had all 3

straight
H pipe
X pipe and the X gave a clear improvement in performance.

that and also i think they x-pipe sounds much much better

[Justincredible]

OH definitely much much better...If you listen to the first rev before the cat back you can hear it is loose and almost FAT AND SLOPY sounding. Then with the X it sounds tight and responsive

http://videos.streetfire.net/video/V...-S4_179558.htm

[enigma1406]

Is this kind of what it sounded like?

http://www.youtube.com/watch?v=W08JmWI9wR0
http://www.youtube.com/watch?v=U_FtFmPAWns

[bhvrdr]

People used to say you will lose low end adding downpipes as well. Removing that restriction nets some of the biggest gains down low though when you see a dyno of a catback only car versus a car with catback and downpipes on the same dyno. Less restriction = more torque. If you lose torque it is usually because of improper exhaust tuning and vehicle tuning rather then just the decreased back pressure.

Here is a dyno. The dyno shows the same car on the same dyno with a catback on it versus with downpipes and the same catback...

[Justincredible]

WOW great info...great post.

It is great to see this on the Dyno. I truly felt the car pick up when I did the DP's.

There are alot of great people on here but some people use opinions other than facts. I know lots of us don't have paper facts to back up our own conclusion But this is TO ME at least. A great sign that freeing up the exhaust PROPERLY is the way to go

[nismonewf]

I always read these threads about exhaust and it never fails someone pipes up with the free flow exhaust = less bottom end myth ... lol I usually am just a reader on these forums but sometimes i have to pipe in because i figured if you guys are toying with real cars and not a 90hp civic there would be more people that know a little more about the effects of modding a car and why certain mods do certain things and the relationship of all the cycles of an engine... the only reason people lose power from exhaust systems is by going too big and losing velocity or a poorly designed exhaust with to many sharp bends hindering proper flow will do it but in most cases it is the loss of velocity in the exhaust gasses .... velocity is what an exhaust needs to pull exhaust gasses from the combustion chambers also called scavenging ... as you increase the exhaust diameter of an exhaust beyond the optimized velocity then you will see drops in power only because there is exhaust being left in the combustion chamber when the next cycle starts ... removing mufflers and cats and a slight increase in diameter from what i can see from my research on these engines the high revving Audi v8 is only going to help as shown above ... by the way nice car : P

i think this is my first post on audizine but ill be around a bit more im in the process of buying an s4 : ) cant wait ..\

cheers guys

[91gl]

Is this kind of what it sounded like?

http://www.youtube.com/watch?v=W08JmWI9wR0
http://www.youtube.com/watch?v=U_FtFmPAWns

if that was it, i wouldnt have turned back. it was much much much louder

[ZEUSROTTY]

if only you had a clue what you were talking about and actually knew this from experience. when i removed the cats the car was an absolute monster above 5000 rpm's. when im already rolling and and blasting along/racing, im seldom under 5000 rpms so i doubt i need any low end there. plus the awe mufflers are straight through and act more like a big resonator than anything, so the only thing ghey here is you for spreading your non knowing BS to the world.

also, i have the VAST o2 spacers in there so i dont burn out my sensors. and any car will benefit from a non restrictive exhaust regardless the tune.

Okay... Maybe Im wrong... But yer idea is still Ghey. And You are a dickhead.

[enigma1406]

if that was it, i wouldnt have turned back. it was much much much louder

I guess, but maybe the video doesn't convey the sound properly. I had that for about 5 days and every time I had to drive I would get a headache. On the highway I literally steered with my knee and held my hands over my ears. It was ridiculous. And safe.

[91gl]

Okay... Maybe Im wrong... But yer idea is still Ghey. And You are a dickhead.

call me what you want, but in the end, you are the dickhead and you are gay since you came onto this thread pretending you know what you are talking about. you = FAIL