Sorry man i hate to throw up a big red BS flag but i'm going to have to, i've heard of people using a code from other gm cars with the same PCM to use HP tuners, but none of it has ever been actually confirmed. I would recomend waiting until it is released for the HHR so that you can deal with the PE delay and not run the risk of running extremely lean. I've been paying alot of attention to this for over a year now.

 

there is a confirmed 2007 2.2 manual/auto on cobaltss.net with real dyno results on the way. its not HPT but its headed in the right direction

 

thats the guy i was talking about, they are possibly talking about making a hpt like program so that you can tune your own. I would rather go with a canned tune personally, or one from someone that actually knows what they are doing.