This turbo is designed for engines producing 300-425 hp and has instant spooling and top end performance. It has been designed to keep exhaust gas temperatures at their lowest point while producing the most power and eliminating turbo lag. It will operate in its peak efficiency producing great boost pressures at cool dense temperatures that your engine needs for more power. The Cummins turbo will also improve fuel efficiency, eliminate turbo bark or surge and explosions. Each kit is a complete bolt-on kit with everything needed to install. This turbo is setup to perform with optimum results on engines that produce 300 to 500 rear wheel horsepower, making it the ideal complement to your Cummins exhaust system. Wastegate pre-set to start opening at 36psi. Capable of 40+psi with proper fueling.