there is a guy on Ebay who sells them like you describe he removes 2 baffles and drills the last one with 3 1/2 holes. His ID is chevy605 I watch him he buys stock pipes cheap and does this then resells them. I gte a kick out of it.

http://cgi.ebay.com/ebaymotors/Triumph-B...118382371QQrdZ1

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!