Speedyjon,
I use modified stock SM pipes because I like the taper.
I only used a 3/4" rotary file in a drill to modify my SM pipes. The file cut into the tube at the rear and removed enough of it to wiggle it back and forth to remove the tube from the second plate. I used the rotary file to work down the endplate until right before I got into the chrome. I used a 6" and a 12" drill bit extention to drill a 3/4" hole in all the plates, beside the tubes. I wish I'd have knocked out all the plates except the front two, leaving the connecting tube intact. These plates are thin and the welds break free easily, so a good long chisel and hammer work great. But the SM pipes being tapered creates a challenge for removing the loose metal. Get lots of compliments on sound.
Ride Safe,
Dennis
