Downpipes...yay or nay?

[blingaling]

So ive searched and i know headers will net hp/tq gains but at 2600 or whatever im gonna have to hold off on that lol but any word on catless downpipes?? Who has em? And any noticable differences and have you dyno'd or done quater passes? Ive searched and besides sound difference i havnt found much on power gains besides what 034 claims.
Thanks, im between downpipes or upgraded trans, engine and diff mounts.

[GRUMPY-S4]

After going catless on my previous car... Never again will I do that on a Daily Driver. Needless to say on a "luxury" sedan


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[schirm]

After going catless on my previous car... Never again will I do that on a Daily Driver. Needless to say on a "luxury" sedan


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Curious as to why you feel that way? I have done it on every car I have owned, just not this one yet.

[schirm]

So ive searched and i know headers will net hp/tq gains but at 2600 or whatever im gonna have to hold off on that lol but any word on catless downpipes?? Who has em? And any noticable differences and have you dyno'd or done quater passes? Ive searched and besides sound difference i havnt found much on power gains besides what 034 claims.
Thanks, im between downpipes or upgraded trans, engine and diff mounts.

I would do it, just be ready for an install cost that might cost more then the DPs. Every car I have owned I noticed an increase with going CATless from throttle response to power.

[GRUMPY-S4]

My cars exhaust fumes smelled soooo much!!!! Plus the issue of emissions testing (finding a buddy to pass it)


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[blingaling]

Ive heard its a pain but ive done all my own work, previous car did the bottom end rebuild and all the work to ko4 it so not to worried about that or emissions i lick and stick all my cars from a friend. More curious if there are actual proof of gains. Catless is always better, less restriction and more smooth flow but with this being my first car that has headers idk if its actually worth the time since the headers are restrictive also

[raudiace4]

Don't do it.
Went catless due to stock cats being blown. The drone is horrible if you have DSG, and the smell is intruding. 100% not worth it, unless your plan is to go full track, strip your car and run slicks with APR's stage 3

[SportVier]

To all the above noise-, smog- and smell-related "nays" above I would add that you will lose some low-end torque, which you will miss for daily driving. The trade offs are not worth the gains up high imo, unless you really value an extra tenth or two at "the track."*



* Tracks have turns. Strips do not.

[F40LM]

I run stock downpipes, no drone and sound is awesome. Only drone exists in the back seat but who gives a shit about them


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[blingaling]

From purely a performance standpoint is it worth it though. Ive had modified vehicles my whole life so smell, noise whatever isnt my concern. I also have a daily so its not any concern.

[GRUMPY-S4]

Why would you want an S4 like that though???? Might as well get a none "luxury" car and go all out


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[moophone]

Purchased Eurotek catless DP's just haven't got around to installing them. They have a dyno showing 28whp/9tq gains

[mrmomo313]

To all the above noise-, smog- and smell-related "nays" above I would add that you will lose some low-end torque, which you will miss for daily driving. The trade offs are not worth the gains up high imo, unless you really value an extra tenth or two at "the track."*



* Tracks have turns. Strips do not.

So you have some data from a b8 s4 to back this statement up?

My car certainly didn't lose any torque. Only good before after/dyno I've seen on here was fonzie's, iirc he picked up 18whp with 034 dp..

I did mine purely for sound though. After hearing apr's race car I was sold on what I wanted to do with my s4 (that's when I began learning how to make this car fast). It's pretty loud once catless so make sure you buy a really nice resonated cat back if you daily your car.

[F40LM]

Lol 30whp from catless dps gtfo


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[mrmomo313]

Lol 30whp from catless dps gtfo


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corrected to 18... that's just what he found

[raudiace4]

Lol 30whp from catless dps gtfo


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Go sell your monster truck already.

To all the above noise-, smog- and smell-related "nays" above I would add that you will lose some low-end torque, which you will miss for daily driving. The trade offs are not worth the gains up high imo, unless you really value an extra tenth or two at "the track."*


* Tracks have turns. Strips do not.

not true.

My car actually had better respone and more low end grunt after installing the catless pipes, its a noticeable difference. The sound at WOT was amazing, but the smell, horrible drone with DSG even with awe touring catback, and the total cost of installation is simply not worth the gains. I only did it because aftermarket catless DPs were less expensive than the OEM cats.

0/10 would do again.

So you have some data from a b8 s4 to back this statement up?

My car certainly didn't lose any torque. Only good before after/dyno I've seen on here was fonzie's, iirc he picked up 18whp with 034 dp..

I did mine purely for sound though. After hearing apr's race car I was sold on what I wanted to do with my s4 (that's when I began learning how to make this car fast). It's pretty loud once catless so make sure you buy a really nice resonated cat back if you daily your car.

It sounds incredible, but a little too loud for most people and in the end just not worth the trouble... unless your cats blow and you have no choice.

[SportVier]

SMy car certainly didn't lose any torque. Only good before after/dyno I've seen on here was fonzie's, iirc he picked up 18whp with 034 dp..

You will gain peak torque and hp, no doubt. But you will lose some torque way down low (e.g. <1500) when you reduce back pressure. Because science.

[mrmomo313]

You will gain peak torque and hp, no doubt. But you will lose some torque way down low (e.g. <1500) when you reduce back pressure. Because science.

Your post makes it sound like you will lose a significant amount of torque in daily driving "which you will miss in daily driving"... Simply is not true. You shouldn't make a statement like that and say "because science" without any real world data to support your claim.

[SportVier]

Your post makes it sound like you will lose a significant amount of torque in daily driving "which you will miss in daily driving"... Simply is not true. You shouldn't make a statement like that and say "because science" without any real world data to support your claim.

Wait, but then shouldn't you have to provide "real world data" to prove that your statement that my statement "simply is not true"?

[mrmomo313]

Wait, but then shouldn't you have to provide "real world data" to prove that your statement that my statement "simply is not true"?

All I have to prove my car didn't lose any low end torque is some 1/4 mile testing I did. I ran pre and post test pipe (same conditions for both runs except I had a CPS and test pipes for the post runs). My car only got faster in the post runs (especially on the front half of the track) ending up trapping 1mph high than pre as well. I am not implying that the test pipes were the reason I did better but I'm reporting a fact that my car did not go slower after adding them to my car... I'm not going to dig through all my old slips to prove this point, I've been very open with my cars performance. You can search for that on AR if you'd like

In the case of daily driving, I have a much less accurate means to prove my case (p3 gauge), pretty worthless measure but if you do it on the same street/same conditions etc. it can be a good reference point. In a before and after comparison on the same street, (I was logging IAT's specifically to test my ams kit) my 0-60's were consistently faster after adding test pipes and cps to my car (all else pretty much the same). Not saying the test pipes made me faster but they certainly didn't slow me down. Feel free to look up my AMS alpha review on here if you'd like to see that

From my observations in daily driving it's the same idea. The car feels no slower down low, sounds much faster though . Imho the day I picked up my car up from the shop with the ams kit and test pipes I was blown away at just how much faster the car felt. My 1/4 mile and street testing reflected that initial feeling...

[F40LM]

Go sell your monster truck already.



not true.

My car actually had better respone and more low end grunt after installing the catless pipes, its a noticeable difference. The sound at WOT was amazing, but the smell, horrible drone with DSG even with awe touring catback, and the total cost of installation is simply not worth the gains. I only did it because aftermarket catless DPs were less expensive than the OEM cats.

0/10 would do again.




It sounds incredible, but a little too loud for most people and in the end just not worth the trouble... unless your cats blow and you have no choice.

Wow, interesting read... Not, idiot


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[colby7]

Do down pipes cause more vibration in the cabin? Or would that be an indication of a poor installation?

[raudiace4]

Wow, interesting read... Not, idiot


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[SportVier]

All I have to prove my car didn't lose any low end torque is some 1/4 mile testing I did. I ran pre and post test pipe (same conditions for both runs except I had a CPS and test pipes for the post runs). My car only got faster in the post runs (especially on the front half of the track) ending up trapping 1mph high than pre as well. I am not implying that the test pipes were the reason I did better but I'm reporting a fact that my car did not go slower after adding them to my car... I'm not going to dig through all my old slips to prove this point, I've been very open with my cars performance. You can search for that on AR if you'd like

In the case of daily driving, I have a much less accurate means to prove my case (p3 gauge), pretty worthless measure but if you do it on the same street/same conditions etc. it can be a good reference point. In a before and after comparison on the same street, (I was logging IAT's specifically to test my ams kit) my 0-60's were consistently faster after adding test pipes and cps to my car (all else pretty much the same). Not saying the test pipes made me faster but they certainly didn't slow me down. Feel free to look up my AMS alpha review on here if you'd like to see that

From my observations in daily driving it's the same idea. The car feels no slower down low, sounds much faster though . Imho the day I picked up my car up from the shop with the ams kit and test pipes I was blown away at just how much faster the car felt. My 1/4 mile and street testing reflected that initial feeling...

[mrmomo313]

Pathetic response. Thought you'd have something constructive to say. Sure I rambled my response from my iPhone and it's a bit disjointed, but really? I actually own said down pipes and have put them to the test unlike you. Next time contribute something useful or don't post at all. We don't need your worthless "because science" conjecture here.

[S4 00 2.7]

Lol

hfc > no cats

[Usa]

Has anyone seen Speedriven's long tube headers?? Sounds amazing...

https://www.facebook.com/jameson.eml...8070508260543/

Wonder if that would pass emissions

[SportVier]

Thought you'd have something constructive to say....

I was a disappointment to my mother as well.

We don't need your worthless "because science" conjecture here.

But isn't that what makes the internet so awesome?