I have a 2012 FX SHO Cruiser with R & D stage 2 kit. I am thinking of adding one or both , chiller or cam gear. The ski is a recreational ski and reliability is important. The ski runs over 75 at 8340 rpms in 70 degree water at 80 degree temp and engine compartment at 89. Do any of you have experience with R & D 's two parts and any recommendations on impeller pitch with a 160 mm.