I know were in the driveline category on this subject not freestyle or race but lets not forget freestylers are always trying to reduce weight and are concerened with weight as much as hp do to flight, whereas racers dont care so much about weight, in fact racers add weight to achieve handling charastics and ruff water blasting. So in reguards to the R&D carbon chamber, that pipe design makes fantastic hp but in its metal form(particularly dry) it is heavy(not to mention high center heavy*freestyle concern*), and due to its weight and design it has a tendency to crack manifolds fairly easily..So making the chamber out of carbon is middle of the road again..the exhaust system is now lighter then a standard FPP "B" system, keeps the engine bay cooler and cools down considerably faster, most likely will not crank the manifolds anymore-no lord mount necessary,is molded to clear PV's and will most likely make equal hp #'s in The Real Operating World of a *Freestyle* engine bay, again we need to throw the false world of a perfect dyno room aside which in no way represents a real world environment....remember pwc have a highly unusual situation when compaired to cars/motorcycles/anything, our engine&exhaust are bascily in a sealed box with limited air volume and a freestyle engine must suck its air needs in as we use no ramed air..Most all of Japans top freestylers use carbon exhausts..