It depends on what turbo you are using from what i hear the rb25 is a bolt and go type thing, if you go for a larger turbo, the injectors, ECU, and clutch might need to be changed. And, if a fitting kit is not available, you might have to custom fabricate pipes and manifold, so it can get very pricey. Then ya looking at looking at a day on the rolling road to set everything up. Such a pain in the ass, BUT worth every loving second LOL :burnout: