I think they are thinking of different types of muffler tips, not the ones that use bolts to hold onto the stock muffler. Our stock mufflers have an extra piece riveted onto them to make them appear bigger, and thats prob the only reason why the tip you have isnt going to fit on. If you *must* have the tip on there then you will either need to take the rivets off the stock "tip" (easily done by screwing through them and ripping them apart with plyers. Or you could just chop off part of that end piece, but I wouldnt feel comfortable doing that...