will a catback from a 07 cobalt ss/sc bolt in a 07 hhr?

 

it may. hangers may be an issue.

 

You might want to do a search. It seems to me someone had done this about 1-2 years ago and posted pictures.....but, I may be wrong. But it does stick in my mind because there was a dispute regarding the fit and he/she proved it was possible.

 

if someone has pictures of the underside of a hhr i could tell you roughly...

 

alright looked at some pictures and all the bends look exactly the same, but i think the hangers may be a lil different but they are really close

 

i think someone with a 2.4 said it hangs a little low because you have to cut one of the hangers off.