I have an '08 HHR SS that I am currently modifying into a street racer. Any An?

So its a '08 HHR SS 260hp 260ft-lb right from the factory. The only modifications done to this car is the LNF kit, and I reprogrammed the wastegate for 20psi (factory 15). I'm working with about 310bhp now, but that's gonna change soon. Any suggestions on what I should do as far as performance goes?