Well I have Trinity Stage IV pipes and wouldn't trade for nothing. Stainless is the way to go,plus you don't need to spend another $70 bucks on pipe clamps. About the jetting I used to run 280 mains with stock carbs +4 timing and 17cc domes K&N with lid removed and thats the same toomey calls for.. And if low end is what your needing than get the flywheel machined..