Hi Greg,
I used a 3/4" rotary file in a drill to remove the rear tube and plate in my speedmaster pipes. With a cheap extension ( i have a 12" & 6" ) you can reach all the plates. I removed the last two baffle plates and bored a 3/4" hole in the other four plates. Sound is good and performance increased. Recommend!!! At least until you can buy some SpecialtySpares or other pipes made by those who know what they're doing.
Dennis
