Yes, I have JCW mufflers. They are the slash cut megaphones though, and I have home made baffles. BUT, they have maintained a perfect appearance for over three years now, and I believe ALL JCW mufflers come with inserts to work with 1 1/2, 1 5/8, and 1 3/4" pipes. Mine was 1 3/4", so I didn't need the inserts.
