I had also called Flowmaster and had asked whether or not they could tell me the part number, if I had told them what kind of car/truck I drive. They said yes. After telling the guy over the telephone that I drive a Bronco, he told me to get a muffler which has a center inlet. He was dead wrong. When I received it from the mail, I could tell immediately that the muffler was really close and maybe wouldn't fit. I asked a exhaust mechanic if he could do it and he said I needed an muffler with an offset. I was pissed off of course. After returning that muffler I decided to get a Dynomax kit ($100) for the F150/Bronco. It included the muffler with the RIGHT inlet and outlet, clamps, screws and a pre-shaped exhaust pipe like the OEM exiting to the passenger side rear. I would recommend it, their was no thinking involved. Removing the old muffler was a bitch but installing the new one took an hour. email me at toughluc @ yahoo.com if you need the part number. I cannot find it now.