Re: things you like to see made for MBs
The city Pittsburgh is quite a hilly city. My bike is my work commuter, so top speed is less important than low end torque and reasonable engine noise. So anything that improves stop and go performance In traffic would help a lot. The expansion chambers seem a bit more for those looking for higher end performance. I know they help torque but the added noise (causes ear ringing and cop attention), heat and potential for leg burning doesn't seem like it's quite right for city commuting. An exhaust more tailored at the low end torque but that is smaller in profile, quiet and long, exiting the back of the bike would be awesome. Like a cross between a expansion and a poo poo pipe.
I guess another way to accomplish that would be variable or two gear on the left side that freewheeled. Peddling still comes in handy during stop and go traffic and looking for places to park on sidewalks , public bike trails etc so removing the drag of the engine would be nice.
I know often folks recommend a jackshaft solution, but the 44t is perfect except for when I'm stuck at stoplights going up a hill. I just need a little exta oomph for the starts. Maybe your improved clutch design would do the trick. It just seems like a more moderate peformance exhaust is a void in the offerings currently.