The headpipe merges into a large 2-1/4'' collector that steps up to a 2-1/2'' coreCore is perforated and wrapped in a stainless steel screen, then enclosed in a fiberglass pillow4'' muffler body capped with a 4'' machined aluminum dual-cut tipBody can be rotated upward from its stock positionWorks wtih stock or extended bagsMade in the U.S.A.