I've been flying my Sig King Kobra for three seasons now with a Super Tigre .61 Ring on it. I switched out the prop from a Master Airscrew 11x7 S2 Scimitar to a 12x6 S2 Scimitar prop. I was actually trying to slow mine down a bit; it was awfully fast with the 11x7 prop turning 13,500 rpms.

I don't have retracts or a tuned pipe on mine, but I wanted mine set up more for sport/pattern than maximum speed. You can get a header and tuned pipe for most any popular two-stroke, and the O.S. Max engines normally respond well to performance exhaust systems:

http://www.macspro.com/tunedpipes.asp

I really enjoy flying my King Kobra and I'm sure you'll love yours just as much. Good luck and good shopping!



[youtube]http://www.youtube.com/watch?v=NN3e7ePELOE[/youtube]