Which would give the best increase?
Thread Starter
Member
Joined: 11-17-2007
Posts: 32
From: CT
Which would give the best increase?
A header or the 2.4 intake manifold swap? I did my income tax return and part of it is going to increase HP. I already have the GMPP intake kit and a magnaflow exhaust. I am now trying to figue out which would be better and if it is the header which brand? Any suggestions?
Senior Member
Joined: 01-13-2008
Posts: 4,708
From: Washington State, where it rains
Lessee..the intake doesn't really kick in till higher rpms..the header works through most of the range....the hp gains are about the same....tough one
Sell it and get an SS with the Stage 1!
Sell it and get an SS with the Stage 1!
New Member
Joined: 12-28-2008
Posts: 12
From: Latrobe, Pa
A header would be the better choice (you have a cat back) the 2.4 intake makes hp but at higher rpms and you lose some low end lb-ft. I have not installed a 2.4 intake on a hhr yet but have on several cobalts and it hurt the bottom end power on the 2 auto ones. (these cars were not tuned)
Senior Member
Joined: 06-04-2008
Posts: 1,882
From: Toledo, OH
do what gto mike did with his stock manifold. or if you dont have the time get the gm performance extruded honed manifold. that way you dont have to worry about fit and tighteneing the bolts once in a while
Member
Joined: 10-22-2008
Posts: 62
From: Vancouver
Senior Member
Joined: 06-19-2006
Posts: 106
From: orlando
if you want a header buy the one on ebay http://cgi.ebay.com/ebaymotors/Ecote...Q5fAccessories this is a cobalt Addiction I knew a few friends install it on the ION 2.2L and noproblems at all..