I don't know for sure, but I think a muffler from a BCMA SPE 26cc looks the same as the CRRC Pro 26. You can go to
www.bcma.com and look at engine accesseries. The SPE 26cc muffler is $25.00. I was thinking about trying one, but I went ahead and cut my cowl for the Stinson. It came out OK, but a smaller muffler would have fit better.