Tell me about it. I've been having a tough time finding good mufflers for conversion engines. B&B and Abell are about the only sure bet, but they are really more exhaust diverters than real mufflers. Most of the aftermarket muffler shops don't much care to cater to our needs. We are either viewed as too cheap to pay for good stuff or too small volume to justify the tooling cost. As much as I hate to admit it, there are probably a lot of truth to both.

The bright side is that engine conversion seems to be a fast growing "sport". Some of us actually enjoy it more than flying planes with them - hey, you know what I'm talking about. So may be in time, things will start to get better.