if your going to put all that cash into the motor don`t cheap out on the pipe. the black bike with the side bleed pipe was my old bike with a week-ends pipe. that pipe unleashed the full potential of the kit with out doing any porting or case matching. the bike ran 55mph no problem and has seen 60 1 or 2 times.
make sure you replace the seal on the stator side. they idle fine and accelerate good but at wot they will leak and say good by to your new kit.
i ran amsoil 50:1 from day 1.