2004 Yamaha Bws 70cc Evolution

with a polini evo motor, a c20/21 or stage 6 1200 should work fine
i dont think you will need something so high end like the mhr team 2
if i were you, i would invest in a mhr overrange first
 
The team pipe will gargle and will be hard to tune. I almost bought one for $170, but passed on it because I was told what I am telling you. The overrange will be the best thing you have EVER put on your bike. You think the bottom end is good now; wait until you hit the gas with that large rear pulley!!
 
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