i know two guys that have SRT 4s. both of them have done upgrades to them. one of them, his dad owns the local nissan, and dodge dealership so of course he has a srt4. he has dropped i don't know how much into it, last i heard it was in the 10k range. it sure as hell doesn't sound like a 4-banger any more. more like a v8. it's one fast car. if your ever close to rolla missouri, look up Grant West. Hes the pretty boy with the car.