Bought this '02 V-Star 1100 with these pipes. I really like the looks, but they are way quiet. When my Harley buddy is in front of me, I can barely hear to shift. The muffler insert is about a 14" long perforated piece - I'm thinking I should be able to get replacement inserts, but I don't know the brand of pipes. No markings, had them both off when I changed the oil. Help!!