whenever i see someone in a convienent store with bottles of octane boost and fuel injector cleaner I want to cry. That crap does absolutly nothing for your car.
solution for hi-octane that runs at least $5.00 gallon if you have $2000 to blow:
get a big intercooler, spray kit and a FFI (7m) and run 93. Higher octane gas is just alot harder to burn and that means less power. Big IC and spray kit with a FFI = 25psi on 93
In the long run it will pay for itself if you drive the car alot on high boost..not to mention it will make more power.