As Mighty Mouse and I have stated previously the Spec they have everything including the flywheel(Aluminum) at that....may be more expensive but look at the torque capacity #'s compare the difference. Whats the old saying you get what you pay for...just remember to change out the throw out bearing while your in there and that the pins on the flywheel need to be replaced as well....Just FYI from 2 people who have already done this. For your viewing pleasure. I went to KY Clutch and they have nothing listed for the car.

http://www.specclutch.com/cars/Chevy/HHR/2008/Single

 

Check ttr. Its on their site

 

I saw it there . but KY has nothing on their site...And why is that? they got something to hide? (KY that is). Put your proof out for the world to see better for business I say.....until proven wrong...All my vehicles have the SPEC clutch and aluminum flywheel all in one stop shop...But I guess Im being biased....oh well have a great day. CHEERS

 

because they have worked a deal with ttr to be their exclusive distributor for their ecotec line

 

I got a spec aluminum flywheel forsale if someone looking for one for a good price.