Oh I do understand, but there's only so good it can flow for it's size. Even a straight pipe with no cats or resonators reaches a limit. It's made by Borla, IIRC, if it's not it's IDENTICAL to the one they sell for the SS/SC. They are a great company, but there's only so much you can do to bend physics before it brings you back to earth.

 

Big exausts might br everated for our cars,a friend tells me you should not have a 3inch exaust unless you are putting out big numbers, the GM catback, corsa et.. are great for our cars

 

There's quite a few choices in between though, I dunno about you guys, but for the Redline we have 2.25, 2.5, 2.75 & 3".

 

Sounds like i just found my next mod!

Its got a good price, good gains, and keeps your warranty. Only thing im wondering is how long it takes the dealership to install it. My dealership charges 78$ dollars an hour.

 

sounds like waaaay too much for a 2.25 system

 

Anyone who says bigger is better with these cars will always be stuck wondering why they just lost a race.

2.25" is more than enough for a SS/SC, a 300WHP SS/SC might need 2.50" but most likely not.

Although it is restrictive a 1998-2002 LS1 (Non SS or WS6) can still put down 280WHP + with a single 2.75" pipe.

Even with 30psi of boost our cars a re still just a 2.0 liter.



I was debating the GMPP exhaust and now seeing true gains I think it's on my need to buy list.

 

It's not as simple as HP... keep in mind the time attack balt was using a Corsa 3" setup, and how did that do at the races?

High RPMS require a larger pipe, forced induction requires a larger pipe. While your 2.75" on an Fbody was plenty, the EGT's of the LS1 are MUCH cooler than a 2.0 running mad timing, 20psi and supercharged, I haven't seen many LS1's pusing 7500 rpms either. In addition, N/A cars thrive on exhaust tuning, just like intake runner tuning along with pressure wave tuning, these are also not applicable on a 2.0 Supercharged car either.

As far as 300whp... what are your goals? Hell, my redline is pushing 260 whp now... 300 is a minimum...

 

the time attack cobalt was running over 300 hp on a big shot of squeeze so it is logical for that specific car to need it.

 

Yea i think spraying a supercharged car makes for an entirely different situation.

But let me re-ask my question. How long is the install on the GMPP Performance cat back exhaust?

 

on racks it can take 1-2 hours depending on if there are 1 or 2 people doing it. on a lift it should take about an hour

 

Thanks dude. Thats EXACTLY what i needed to know. So installation shouldn't run more than 160 plus tax. Now all i need is the exhaust system and 160 bucks.......

 

Its an evap canister

 

It should not take over 30 minutes. Especially for a professional.
1 hour MAX if you are doing an exhaust for the first time….

 

Now seriously, 12whp for going from a 2.5inch catback to a 2.25inch. I mean maybe the air flows better, but dont you think that magnaflow being 2.5 inch and true mandrel bent. I mean download a pictures of the GMPP and the bends arent nearly as nice as vibrants and magnaflow ect.. so really your 2.25 inch could be in reality like 2.15... Now that is small. We need backpressure for our supercharge to work well, but i still think abything smaller than 2.5 inch is a waste of money. I saw at a couple of places a gmpp catback and highflow gmpp manifold giving 6whp on the dyno. Seems low, but this seems high

 

Sorry bro but there is no difference in the bends of these exhausts. They are both mandrel bent. Backpressure is more important than most people think.
The 2.25" gives good backpressure for low end power and the free flowing bends and muffler give you your mid and top end. I think it's a good exhaust, just my opinion.

GMPP



Magnflow

 

yeah yeah i understand where you are comming from bud. But if you want to put headers and downpipe, well they dont make 2.25inch, you have to got at least 2.5 inch and 2.25 inch catback isnt perfectly ideal, although it would still work good. Guess thats where iam comming from when i talk about this... i want to put headers and downpipe this spring

 

I remeber seeing somewhere that someone here with gm performance sais that if you are not pushing over 300hp you dont want to go over2.5 cause the car runs better with 2.25-2.50

 

I am most impressed with the underbody of the Cobalt. GM did a great job getting the suspension nice and deep into the chasis as well as making the underbody as smooth as possible for a car in this price range. Flatter the belly the better high-speed stability we will get, and I don't know about you guys but 100 mph feels like 100 km/h in most other cars.

I told my girlfriend to close her eyes while I slowly accelerated and I asked her to guess what speeds we were at. She consistently said 100 - 110 km/h while I was really going 170 km/h. She's the biggest critic, cause' she's a real wuss about speed.

Exhaust looks great, it's on my list too!
RYan

 

the exhaust tucks away nicely and is otherwise out of sight on a level plain.

 

It will be my next mod, I am almost done spending money on this car. CAI, and exhaust then, I move into the interior.

 

Here's a good question..............You are running with LSD. Would a 2005 Cobalt SS/SC without LSD make similar gains? Just a question???????

 

of course your engine itself has nothing to do with whether or not there is an lsd installed or not. that is a different argument for a different day and running a search will show the results of that as well so the gains will be the same to make a long story short

 

why is the sport more than the touring? anyone know?

 

the two are supposed to have the same gains

 

oops, sorry. i meant why does the touring cost more than the performance? has anyone heard the touring next to the performance?