he says that dirt,water,etc. will get inside an damage my motor. says it dont help any.BUT, i know he used to race dirt bikes, ride them, even sells pod filters for them...idk, its nuts.. even told me didnt need or have to change small clutch springs, said oem is good... hes the only one around here that i would even consider cuz another local shop sux bigtime. nothing but issues in town..idk if he just loves oem or what, its frustrating in my world, I DONT WANT O.E.M, I WANT TWEAKED OUT!!!!...oh, does super9 parts fit on zx???. seen wrecked one, had motor parts...