I'm considering mounting an OS FX .61 inverted in a 1/5 Piper Cub J/3 to avoid cutting the fiberglass cowl up to badly. I'm trying for a decent authentic look.

I've seen inverted, in cowl mufflers but a couple of shops have tried to steer me back to a side mount with an in cowl muffer. They state engine run issues with inverted mounts.

Anyone have any good/bad experience with inverted 2 cycles? I'm trying for good looks, but don't want a touchy, unreliable powerplant either.

Thanks.