The Rotated Turbo Tuner kit is designed around the customer who already may have a turbo, and or a wastegate,and is looking to install them onto their WRX or STI. As long as you have one of our supported turbos and wastegates, you can get the same level of performance offered in our complete Rotated Turbo kits. Every kit includes all necessary items (except turbo and wastegate) to install on your WRX/STI (with Front Mounted Intercooler.) With many years of production under out belts, you will feel confident that this kit will last and perform. PERRIN Turbo kits are not for the faint of heart and it is best to speak to a PERRIN specialist before ordering. Let us help choose the exact combination of turbo and exhaust housings to meet your needs. We can help you choose the extras that make this project successful from things like ECU tuning tips, recommended engine internals, injector size, fuel pumps, etc.