I have a very conservative setup related to boost, fuel pressure, and timing. It is an 80 mph (GPS) boat. I did the install myself over last winter. Mid range is awesome and has a great cruise speed. Prior to the prochargers it ran a best of 69, most of the time it ran 66-67. I also added a very nice sterio system with custom glass enclosures of the winter so I added some weight also. Boat has all the good stuff, stainless marine exhaust, big K planes, hydraulic steering, trim in wheel, gaffrig controls, drive tie bar, eagle tripple axel trailer with 3 axel brakes, xm sterio cd changer, the list goes on....