I bought this on kijiji (classified add) with yamaha base gasket and needle rod bearing for cheap. Everything is brand new , cylinder has been made in 2008 . I wonder how many more hp this cylinder can produce compared to stock and if it will match with a fmf fatty full exhaust cause this cylinder is probably for hi-rev... from the research i have done I can't have another vertex piston without windows like the one that comes in the kit.