Mak10,
Wow...sounds like you've done a bit of fabrication there! I discovered this part of the OEM muffler recently & removed the 'spark arrestor' protion...which I will put back after bit of modification. Had I known your skill level, we could've worked something out for the Delkevic I just sold yah! Am I wrong that by removing the spark arrester portion reduces the engine braking affect on the S10? It sure felt like the bike kept rolling after the throttle was shut off, where as before, it would definitely slow down due to engine braking.
kmasa58