It only took one engineer to reverse design the BD fuel stop plate. We offer 6 different ramp designs of the fuel stop plate that result in 30 to 150 hp and 70 to 300 lbs of torque increase. The kit comes with a calibrated orifice that improves your turbo performance. We do suggest a 14 cm turbine housing if you are going beyond the 250 hp level. The increased exhaust flow requires a larger turbine housing and should have a larger exhaust system, as well, for peak performance. We recommend this kit be installed by one of our technicians at Coastal Diesel. It requires opening up the fuel pump and precise setting of the plate to insure the proper adjustment to prevent over fueling of the engine.