or the 550 pump and a half pipe setup will work.. as stated get the lowest pitch impeller you can find and bore the nozzle out.. getting a stubby pump cone may help as well.. the pjs cylinders are same as stock kawi reed.. but different.. they use standard 750 small pin reeds but every internal engine component are stock 550 reed setup.. pistons, crank, rods etc.. the only difference is the intake side. different intake mani and reeds.. a standard exhaust manifold and pipe setup with bolt right up.. starter and electronics are even same as stock 550.. youll find the ebox makes things much easier to work on too.. i have the viper7000 engine in my ski which is same as yours just 2 sbn38s instead of single 44 and it makes 70hp to the 5000's 50hp