Originally Posted by AJcruz1
Sorry but the mufflers can't be used without the pipes. Just so you know you would be hard pressed to get the pipes to work with you axle backs which are designed to work with the stock 2.25" pipes. The pipe and connection coming out of the the axle backs in the cat-back are 2.5" in diameter.
I guess I wasn't aware of that. They have the 15595 axle-back and the 15591 cat-back, but they all mention 2.5". Are you positive about that? All this time I was thinking the only difference between the two were the pipes being included on the one, but thought the mufflers were exactly the same.