I'm considering setting up a Diablo 2000 with an OS 160 FX with a side-mounted muffler.

Does anyone have an opinion on how it will compare noise-wise with a rear-exhaust, pipe equiped engine? (E.G OS 140 RX with factory pipe?)

Are there any after-market mufflers that reduce the noise more without robbing power?

I might also need a short extention to clear the cowl. Any leads on a source for one?