Chevy Cobalt Forum banner

Status
Not open for further replies.
1 - 6 of 6 Posts

·
Registered
Joined
·
212 Posts
Discussion Starter #1
I know there are many threads about the GMPP cat-back. HOWEVER, I don't believe ANYONE has really dynoed their car with the cat-back only. I've searched HIGH and LOW no website (not this nor others) can tell what are the gains.

Then, after hours of searching, I've hit this site: 2007 Chevy Cobalt Exhaust Upgrade - GM High-Tech Performance Magazine

I don't know if everyone read it, but the GMPP performance exhaust was installed on the SS 2.4 the only gains were 1.2HPs??!?!?!? My jaw dropped after looking at their dyno sheet. I understand that maybe perhaps that the 2.4 has a less restrictive exhaust and they have an auto version, but even at that, how much is there to gain from this?!?

This is really disapointing to see, I don't think people's "butt dyno" is very accurate. Sure the exhaust "sounds faster" but I now question it's actualy potential on the 2.2?

If you read on the article, after they drop in the GMPP intake (mine's on the way), they then gained 6.8hp. I assume that's because they already have the exhaust in place, but seriously, almost a grand worth of upgrades for a mere 8 hps? I mean it is a 2.4, but are we going to see better gains than that? It's essentially the same motor, but larger displacement no?

Comments?
 

·
Registered
Joined
·
1,336 Posts
you wont get any significant gains just from a cat-back.

you also have to swap the header and downpipe as those are more significant bottlenecks on the exhaust...as to how much gains, I have no clue.
 

·
I cut stuff
Joined
·
6,238 Posts
Well I don't know how much I believe it but I've seen a site claiming it's a 12hp gain. I wish I could remember where I saw it though.
 

·
Registered
Joined
·
212 Posts
Discussion Starter #5
Well I don't know how much I believe it but I've seen a site claiming it's a 12hp gain. I wish I could remember where I saw it though.
and also here,

http://www.*************/forums/showthread.php?t=32554

but that's on an SS TC (I think). There's no way that a 2.2 would get that kind of gains, but 1.2HP is just rediculous. I mean COMMON!!!! I thought factory performance parts are -- usually -- the best designed for your car....

Geez, I hope I didn't blow 6 bills for 1.2HP.... (or less...)

Anyways, no one seems to really know....



ok seems like YC autoblocks links to other site well it's off the CSS site:

http://www.FILL THE NAME YOU KNOW.net/forums/showthread.php?t=32554
 

·
Registered
Joined
·
1,036 Posts
Yea the site claims 12hp but I think they're assuming that you have a full exhaust with header and downpipe.
 
1 - 6 of 6 Posts
Status
Not open for further replies.
Top