hey guys i notice alot of turboed cars u can buy a down pipe(with no cat) i was wondering if anybody has one or know the effetc that would have on the performance...and sound it would have on the ss s/c cobalt? and if someone does make one where could i get one thanks

 

ZZP makes one. With and without a cat. I heard a catless downpipe the other day. Didn't sound all too bad, which was stoping me from getting it. You could smell a difference if you paid attention, but that was it. I plan on getting one next week.
I guess the cat is pretty high flowing, but it's also the biggest robber of flow in your exhaust. So by removing the cat you'll see the biggest improvement in power

 

I'm running the Catless DP from ZZP. Easy to install, and sounds nice (except for the whistle it makes) But you will throw a CEL.... unless you get your #2 o2 disabled.

 

how do u disable the #2 o2 ...and does dat have an effect on performance

 

I'm just going to not worry about exhaust from here on, I'm just going to get the quick time electric cut-out and throw it in before the cat. Then I can have nice sounding exhaust for the street and straight exhaust at the track. Plus when the time comes for emmissions I won't have to worry about it.

 

Hptuner's Software

 

You can purchase an O2 simulator also and replace your second O2 sensor with it. that will also fix your cel problem

 

Hp Tuners will let you disable just about anything. Its well worth the money also.

Kyle

 

cobalt-addiction also makes down pipes, 2.5 and 3" with or w/o cat. check em out... I have their 3" w/cat, and its awesome, feel definate power increase and it sounds much better than stock.

 

will a 3' downpipe match up to the stock exhaust?

 

I need to know if a 2.5 will have flanges that will match my 2.5 magnaflow?

 

if it matches you stock downpipe flang then no problem

 

yeah it does and i have it as well

http://www.youtube.com/watch?v=Ww4B9R0Jsww

 

There is a difference between a downpipe and what you have, a b-pipe. A downpipe comes off the exhaust side of the turbocharger and goes straight down, hence the name downpipe. You have a regular exhaust manifold that has a pipe that goes downwards to connect to your catalytic converter. That's your b-pipe.

They have downpipes that delete the catalytic converter available for sale for turbocharged applications because for them, the less backpressure created, the easier and faster the turbine spins. Too less of backpressure on a supercharged application can be a negative effect...because they know this, this is why they don't offer header setups that "delete" the catalytic converter.

 

Anyone have the zzp header with the down pipe also? Was thinking of getting both.

Kyle

 

but if your pullin 15 psi at 2500 rpm the backpressure is not a good thing.... which is why they do offer header b pipe config with the cat delete... I won't do that because of emission laws in ny which is why I went with the 3" with high flow cat.

 

I should have been more discrete with my words...

They USUALLY don't make headers like that because of backpressure reasons. Too less of backpressure can effect your overall PSI #s.

Just a note that my friend just shared with me...

GMs Cobalt Cup Car that runs 18 PSI went from a 3" exhaust to a 2 1/2" exhaust...just something to think about.