Wasn't there a thread not long ago where someone cut the stock expansion chamber down the middle to show the internals?? All those little nooks and crannies for sand and small particles to hide OUCH!! for your poor motor.
There were some decent used pipes on e bay not long ago. I'm not sure if there there anymore though.
There were some decent used pipes on e bay not long ago. I'm not sure if there there anymore though.