Need some help from people who still hvha their HHR. I have this car long enough to know not many gains are gonna come from the 2.2. I just to know what others have done to Squeeze to most out of this little motor and how much has been gained. Only thing done is header. I already have a go fast car. Just need to know how I can Squeeze a little bit more from the daily. Thanks.

 

I had a 2010 LS before I got my 2010 SS. Be happy with what you have. If you have a lot of miles on it check the chains. I do miss getting 33/34 MPG from the LS on the open road compared to 20(?) with the SS.