To my knowledge, the only 2 labels used on the HHR SS are "Premium Fuel Recommended" (Stock), and "Premium Fuel Required" (GM Turbo Upgrade). If your car has a "93 Octane Required" sticker, I think someone might have put a Corvette Z or Cobalt SS Stage sticker on it by mistake.

And on tires, I can vouch for the high performance tires. My LT has 18 inch Cobalt SS wheels with 225/40ZR18's on it and it handles "almost" as well as the SS.

 

In my opinion the FE5 Suspension is AMAZING! I dont care that is it still as I have ALWAYS upgraded the suspension on any car that I have owned with lowering springs and improved shocks/struts....on my HHR SS I will NOT BE TOUCHING the suspension (except those damn bushings making noise when it is cold outside) because it is literally one of the tightest suspensions that is still forgiving I have EVER had the pleasure of driving!

I just hate how my sunroof is loose and rattles over bumps, but thats a issue with my car only I believe, there is a TSB about it but I dont want to waste the money to take it in and get it fixed so I normally just put it in VENT mode and increase the heat slightly....gets me going on another topic....just found out my car has GMPP Major Guard, trying to get it transferred into my name before the 30 days is up, which is this weekend :/

 

I have to agree with the suspension. GMPD did a helll of a job on tuning it. They have finally learned more is not always better. While they backed off getting the top G number they have improved real world drivability.

In years past too many of GM's top perfroming cars would crash over bumps and uneven surfaces and only shine on smooth roads.

I am not going to tweek mine as I drive it daily and have no need for the small gain with the bolt on's.