hello, I got a 2008 Subaru Impreza 2.5i sedan with the following improvments. So far I've got a Tein Super Street suspension, Cobb short shifter with bushing, HID lighting system, ZEN 17" wheels with a set of Goodyear Eagle F1 rubbers, a pair of Sparco Reclining racing seats, Brembo braking system from a 2008 sti, SPT and Injen cold air intake (had to modify). N1 mufflers are coming soon,
You can always option for greater performance part to enhance the power of your car or you can get all the bars bolted up to make your car stiffer and better handling.
i own a Subaru GDB too and i have bolted all the bars and the reaction of my car in terms of handling is superb.
Contact me if you want to some of the parts. i can get it for you.
Don't go with a cobb map. Go to Camtuning.com and become a member. The options are limitless. Personally, having bought an 08 wrx myself I know that if you want more bang for your buck....buy a turbo back exhaust and get it tuned by Cameron on Camtuning!!!! Camtuning.com has all the answers to your questions on what and where to get stuff for your car. I love it!!!