Pypes products straight up suck I bought a catted x-pipe and catback and pulled them off and sold them in less than 2k miles. Fitament and quality suck and I didn't really care for the sound...more of a nascar sound than that nice throaty growl you expect from a 5.0. If you want an off-road pipe i would recommend MAC or Bassani, if you want a catted pipe you can pick up a Maganflow at performancepeddler.com for around $300...that's what i'm using now and am loving it.
I ran UPR catted X pipes and then bought Pypes off road X pipes. No fitment problem with either of them. They both hung a little low. The UPR piece has the cats right at the transmission crossmember which keeps you from tucking them up high.