A couple more photos. Notice the early CNC machined exhaust diverter/muffler on the model B, as well as the Bisson inverted muffler on the RI version. I have a wraparound also just like Jai's one in the photos above, plus a narrow wraparound that's meant to fit inside narrow warbird cowls. This latter one is what came standard with the RI version.

I installed the red bellcrank, which is a modified Hitec servo arm, with a brass bushing. It's more rigid than the stock Dubro nylon bellcrank, thereby reducing some slop in the throttle linkage. Also, that was 7900 rpm on an 18x8 MA Scimitar. After some more running it eventually hit 8400 on that prop with the straight diverter (really LOUD!). About 7800-7900 with the narrow warbird wraparound. 7100 for the RI version on the 19x8 Mejzlik.