first of all, i agree with the previous poster on most mods. however, the stock fuel and electronic management is more than enough for our car. they can handle much more than you can throw at it, unless youre able to push your car into the >400 HP range. this is at the wheels, mind you. read that primer, i gained much insight...it breaks it down step by step according to what HP bracket your're aiming for. dont worry about an upgraded or aftermarket turbo yet. stock boost is 7 lbs (roughly), invest in an accurate boost gauge and a boost controller. you'll be able to push a few pounds into the double digits. down the road, you'll need to upgrade handling as well...so start saving!