In your opinion what are the loudest best sounding axel backs out on the market for Mustang GT? I am considering strongly the SLP Loudmouths and the Flowmasters. I am not planning on using an X pipe, just the axel backs to change the sound.
If you want loud SLP! They are insanely loud. Not my taste, but I see why people like it. I would go with the Loudmouth II if they offer it for the 05s. Its the same as the loudmouth I, but the inside was rework to eliminate some raspiness. Sounds a lot cleaner, and the difference in volume is almost the same.
The Loudmouth II'2 are technically the SLP powerflo's. I don't think the LMs are insanely loud, which is why I'm adding an O/R h-pipe. Obviously, exhaust is all preference. And mine is that the flowmasters are bad and the SLPs are orgasmic.
Loudmouths are very nice. Not too bad at idle, they scream at WOT. Also a plus is the lack of drone since they are not a chambered muffler. The FRRP or Borlas also sound awesome. Very deep idle and sound SICK at WOT, minus is some nasty drone in lower 2K on tach while part throttle. I myself will be putting Loudmouths on mine. I was always a flow guy, they are not that deep or aggressive on the S197(no offense flow owners just my.02).