GMPP manifold ?
Senior Member
Joined: 01-13-2006
Posts: 1,059
From: Tucson, AZ
GMPP is just a Extrude Honed version of the stock cast iron manifold. I know the guys on www.cobaltss.net are using these on the 2.2 cars but you would have to check and see about the 2.4.... I am pretty sure they would fit since the headers put out by most companies are fitting BOTH the 2.2 and 2.4.... So your chanced are VERY good that it will fit!
Thread Starter
Senior Member
Joined: 06-26-2006
Posts: 111
From: Houston
well, i dont know if it does, or if the hhr's exhaust is setup a tad different than the cobalts, but im gonna go ahead and be the test dummy and try it out, i hope it fits, the cobalt ss guys claim they get 4-6whp and 4-5w trq, i guess every little bit helps eh...
Thread Starter
Senior Member
Joined: 06-26-2006
Posts: 111
From: Houston
Originally Posted by flyhhr
if it is fitting the 2.2 it will not fit the 2.4 the flange that bolt's to the cat. is different just my 2 cents
Senior Member
Joined: 05-03-2006
Posts: 882
From: Newfoundland, Canada
Originally Posted by dnbguy86
Any evidence to back up this claim, there's numerous people on the cobaltss.net forum that have put the gmpp manifold on there cobalts.
Senior Member
Joined: 12-21-2005
Posts: 1,010
From: Launch Coast Calif.
Originally Posted by dnbguy86
well, i dont know if it does, or if the hhr's exhaust is setup a tad different than the cobalts, but im gonna go ahead and be the test dummy and try it out, i hope it fits, the cobalt ss guys claim they get 4-6whp and 4-5w trq, i guess every little bit helps eh...
Do it...
Founding Member
Joined: 08-21-2005
Posts: 1,207
From: NE OH
If your gonna get one, don't miss out on the group buy!
http://www.cobaltss.net/forums/showthread.php?t=32085
http://www.cobaltss.net/forums/showthread.php?t=32085
