When the ex comes out of a piston engine it squerts out over a long time frame a few m.sec ,in a rotary it comes all in one big wave 0 m.sec , they both it your ear and one sounds louder "the rotary" even thoe they both have the same energy lever. So if we can get the ex of the rotary to think it is comeing out of a piston the sound level will be what evey can stand. So here is a pic and the size is up to you. We need holes small ones about 1/8" to start with and a shell that can be thaken so we can tune it by makeing the holes larger. we need a test port so we can check back perssuer , dill the holes out until the perssuer is what we can live with. slight back perssuer is one of the keys to making this work. Also there can be a insert that is removeable for race day which can help with keeping the cops off your tail. I know some are going to have quiston .

 

question your spelling maybe

I just prefer a straight-through exhaust, with a removable muffler - way easier

 

ok so my spelling some times ant so good.I'd played with this for lots a years and so fare no problems with the cops or just blowing them apart