Anyone running an exhast larger than a 3"?

[pboglio]

What I know for fact is that post turbine you can do some radical shit and not affect the low end much if at all, as long as your ignition timing and fuel is clamped down. However, preturbine I've definitely noticed a slight but noticeable drop in low end torque when running a non-stock exhaust manifold, with measurable high rpm power gains.

 

[TSimage]

Who are you talking to? I obviously don't DD my car around. And yes, a 3" dp and exhaust is good enough. It is very well capable of at least 600 HP.



Does you car actually pass California smog with the 4" exhaust setup?

@ CA emissions...

I run a top mount s475, think your HX52 but bigger. I'm so beyond the realm of passing a smog test, that is the farthest worry of mine. There are ways around it..

 

[dsmusmc]

Come back when your flowing 89 lb/min. Better yet, run what you have right now and swap to a 4" catback on a dyno vs. a 3" catback and if you pickup +5 h.p. in the 6000-7000 rpm band I'll mail you a $10 bill. Then start investing some stock in ear plugs. Worry about what you need to worry about. This is like staying up at night worrying about needing titanium connecting rods for 300 h.p.

I could tell you what to do with that $10 but ill be nice. I dont think you understand that 1gDSM4g63 (HX52) and TSImage (BW475) both need 4" sense there turbos are a 4" v-band outlet. If they did a 4" downpipe off the v-band outlet then went to 3" the rest of the way it would kill there HP. Would you run a 50 trim with a 3" downpipe then run 2.5" cat-back on?

IMO unless you are running a turbo that has a 4" outlet then 3" is plenty.

 

[1gDSM4g63]

@ CA emissions...

I run a top mount s475, think your HX52 but bigger. I'm so beyond the realm of passing a smog test, that is the farthest worry of mine. There are ways around it..

Oh yeah, I know there are way CA emission, $$$. Just wondering why you went with a full exhaust setup.

 

[TSimage]

Oh yeah, I know there are way CA emission, $$$. Just wondering why you went with a full exhaust setup.

Its still a street car. I can drive it around and not get hitup by the cops. Plus I'm not a fan of side exits by any means. Some classes even require full exhaust to run.

I blend in minus the front mount which itself is 100% legal.

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Can you say "Sleeper.."

The chute is removable, the center light section covers the kill switch and external battery terminals plus the cage is about as hidden as you can get so I'm pretty safe. If a cop ever made me pop my hood he'd let me go on the basis he'd never want that much paper work.

 

[dsm-onster]

What I know for fact is that post turbine you can do some radical shit and not affect the low end much if at all, as long as your ignition timing and fuel is clamped down. However, preturbine I've definitely noticed a slight but noticeable drop in low end torque when running a non-stock exhaust manifold, with measurable high rpm power gains.

So yes, to get the most flow, doing away with all the exhaust or making it as big as possible is just fine for max effort even on the street since it does "not affect the low end much if at all".

 

[1995gsx20g]

Tsimage, i strive to have a build like yours..

 

[laser90]

Tsimage, i strive to have a build like yours..

x2