I cut the ends off about eight inches up. Removed the next two baffles and drilled mulitple holes in the final one nearest the inlet. This sounded a bit harsh so I welded a Washer with about an inch and half opening, about an inch from the exhaust end. Has a much deeper tone than the epco's I have. Far as performance goes I can't tell much if any differance in the modified pipes and the epco's. Course you would need to dyno them to be sure.
