Curtis flew his new Muscle Pipe Muffler at the US Nationals. It is quiet a bit different than the previous Muscle Pipe. It seemed to perform well for him. To me it looks like a KSJ Muffler on steriods.
It is a direct bolt on canister type muffler. The front 3 or 4 inches of the muffer/pipe is about 2 inches in diameter. The back 4 or 5 inches of the muffler /pipe is about 3 .5 inches in diameter. It seemed to preform well for him turning 1850 in a hover and 1800 in aerobatics on a 7.6 ratio with his OS 91 and pimp setup. The set was really quiet also.

David