Expect about 8000 rpm. The 3270 robs quite a bit of power. (My test engine with Xoar 18x8 prop and 3268 pipe runs at about 8200 rpm and takes a 14lbs plane into unlimited vertical.)
MVVS does not make a wrap-around for the 30. Bisson makes custom 26cc mufflers. (same engine dimensions as the 30)