Is it worth buying the GMPP Sport Exhaust for an 09 SS/TC?

 

from what I've been reading...no. Only because its only 2.25in piping. I think alot of people are going 3in or atleast 2.5in. Hope that helps

 

no. anything else?

 

love ur sig^^^^ and yea i would agree with 3 inch on a turbo...

 

Yes, boost needs bigger piping. I have the GMPP Performance on my 2.4 and I love it, but I'd go bigger on a boosted car, especially turbo'd..

 

Thanks for the help guys... this is why I love this forum... nobody bashes you for asking a question... unless its just a stupid question that you already should know the answer too... but thanks for the help


CSS.NET = FTW

 

haha

Sometimes they do..

 

Yea please dont get that. 1 its a rip off for us. 2. Plenty of vendors making wonderful parts

 

ss/tc GMPP exhaust(s) does not exist, u would have to cut all the flanges off and weld the entire exhaust on.

BTW, both touring and sport GMPP exhausts are 2.5inch

 

Sorry your wrong, its 2.25", it is only available for the ss/sc, 2.4 and 2.2 ecotecs, not the ss/tc. Even though its only 2.25" it flows much better than the larger diameter none mandrel bent 2.5"stock exhaust on the ss/sc because of the straight threw resonator and muffler, plus IMO one of the best sounding exhausts on a SS out there.

But back to topic, ya go 3" exhaust on the new turbo version, Hahn makes a nice catback

 

where are u getting your info from??

 

What is the diameter of the stock exhaust piping on the SC and TC Cobalts? The GMPP diameter is 2.25 because it maintains exhaust velocity.

Why not put a 5" exhaust, that would flow more freely right? That would be bad because it would be too large and not maintain the velocity of the exhaust. Honestly the 3" piping is a marketing tool, I don't think anyone with a Cobalt needs piping that big. We drive compact cars with small displacement 4 cylinder engines, we don't have big V8's that make a lot of exhaust and require 3" exhausts.

 

I think the stock piping on ALL SS's (2.4, s/c and t/c) are all a mix of 2.5 and 2.25 I think.. But the GMPP is 2.25 all the way through to keep things stable. I believe the welds are also smoother and what not. It is a more optimal flow. But you could probably make something else for cheaper than the full retail on the GMPP. I got mine used for $200..

 

True... and wrong.

True that the GMPP Cat-Back will not bolt up to the SS/TC...

Wrong in that GMPP Cat-back is 2.25"... I had it on my car. It was 2.25"...

With the stock turbo... its not that big of a deal. But you bump that turbo size up just a little and a 3" Exhaust will make one HELL of a difference on Spool time.

True. My GMPP is for sale for $250 right now.

 

That your girl in your avatar? She's gorgeous, man. Props to you.

 

No
it's too small..i heard its a 2.5" so its practically stock with a nice tone..IMO

 

No, it is 2.25"... its been said 5 times in this thread now.

And it is a good improvement over stock on an SS/SC, because it flows better - straight through mufflers. I don't know about for the SS/TC... I don't know anything about their cat-backs.

Either way... it won't bolt up.


She's a hottie...

 

there is no need to mantain exhaust velocity or maintain backpressure on a turbo car end of story. you can run whatever exhaust you want but why not go with the 3" to leave room to upgrade? 2.5" is good for like 400 hp.. what are you shooting for?

 

I'd say she is. Props again.

 

Im like the sound of my car... as far as performance... im pretty happy with it, not looking to make it any faster for now... since its my daily driver and such, so just a little bit more noise at full throttle.... if that makes any sense.

 

For a stock turbo car the factory 2.5" setup should be fine. If you're looking at getting a custom tune/calibration the only part of the system I'd probably upgrade is the factory downpipe/cat and maybe the muffler if it's too quiet for your tastes.

 

hey will the gmpp exhaust work on my 2008 cobalt lt with the 2.2 in it

 

If u look underneath the ss/tc the underbelly would not allow for a str8 exhaust. It would still be a s bend pipe just slightly larger diameter

 

is it worth buying one for a 2008 cobalt lt with a 2.2