Originally Posted by m4a1mustang

TBH I'm not sure about FRPP parts and warranty; I think if you order through the dealership and have them do the work there is some sort of limited warranty on parts, but for something like exhaust I wouldn't be concerned with that.

Axlebacks obviously are just for sound. Power gains from swapping the mufflers are absolutely nada... zilch... nothing! The real gains with the 5.0 are when you replace the cats with HFCs or just get rid of them outright.

The Cat-back is going to give you all of the piping from the cats back. In the case of the Borla S-Type cat back, the H is replaced by an X and the factory resonators are deleted.

In my case, I don't care about squeezing any extra power out of the car through the exhaust. I wanted to keep the stock cats. The only change I wanted was with the sound, and by swapping the mufflers and X pipe I could achieve that goal rather easily.

If you don't mind spending the money, and if you want it a little louder (due to the deletion of the resonators), I would consider getting the Borla S-Type cat-back. You get your X pipe and you replace all of the piping back to the mufflers.

FWIW, though, the gains from just a catback are minimal. Most come from the headers and cats. There are a TON of options out there, so just take your time and sift through them all!


@Red, good stuff!