I'm just going out on a limb, but I'm assuming that these will work perfectly after trying to compare pics of the underhood of a Cobalt SS/tc and HHR SS

http://www.synapseturbo.com/mm5/merchant.mvc?Screen=PROD&Store_Code=SM&Product_Code=syn-syn-chp-001&Category_Code=intercoolers

I am pretty sure they are different, from looking at one in person they dont look the same. but idk

i think it will work,but i would be prepared to move some stuff around and bend some things.

Yowza! $600! That'd better be some awfully nice piping.

Yowza! $600! That'd better be some awfully nice piping.

seems like all their stuff has shown good results. Theyre working with beta HPT doing testing on the LNF and with that tune (not being able to control boost [23psi]) they gained 100lb/ft with the tune and downpipe they have.