the only mods to my 88 x2 right now are sbn 44, westcoast f\a and mani,accusteer, wc plate and grate. i am adding a westcoast pipe this winter. i have the stock prop now and the 9\17 will be a huge improvement right? i wanted a 8\16 but i can get this 9\17 and it is in great shape? i guess i'll jump.