The Wankel rotary engine is a fascinating piece of hardware but it has a few weaknesses:
On a HD somewhere, maybe. '07 was prior to the ubiquity of the smartphone. It has a 3" long exhaust pipe, no muffler, and is peripheral ported. During engine MOCs you could spend time hooking it to a test fixture, or chock it with sandbags and you and your buddy's legs and murder your hearing. With muffs AND plugs, it still hurt.