With the combination of my fatty's, 157psi, and boyeson rad valve. My 'shee has the smoothest pull of ANY 'shee i've ever ridden w/ similar mods. I had the opportunity to switch 'shees for 5 laps w/ a guy who had t5's. Let's just say I wanted back on mine by 1/2 through the second. For mx I would go w/:
Fatty's, pro circuits, mr.bills, ptr mids, sst's or 2:1 (in no particular order)
K&N setup w/ adapter plate (noss, pro-design etc..)
Delta's, boyeson, or ported cages(no experience w/ those)
With that motor and good chassis mods you could place 1st every weekend in the amatuer (A class) or pro (b class) circuit.
Mike