I brought the muffler from an online ATV store. It was the right part number. The box said it was for a 98 to 04 Honda Foreman 450S/ES. The instructions also said for a Honda Foreman 450S/ES. The ATV online store said they would take it back and order me another one. They would pay the shipping too. However, it would cost them 10% to return it. I got a good price on it, and they are very friendly. Great service!! So to save them a little money, and me some time, I sent it to FMF. Customer service at FMF could not tell me why the muffler was made incorrectly. Today, I called customer service, and they said it was shipped to me this morning. They still didn't know what or how the muffler was fixed. And they didn't have a tracking number for the package. If they did ship the muffler today, I should get it Monday. We' ll see.