I have their 2.5" system on mine. Sound is good (not obnoxious loud like brand F, but still throaty). However the fit is not so good. There are not enough bends in the front, so the exhaust is sitting right against the floorpan (literally). Everthing past that fits great.
On a positive note, based on quotes to mandrel bend and install a new front section will still be equal to the cost of having a complete system done from scratch locally.
I was looking at Pypes originally also, but wanted to save a couple bucks. If the Pypes kit is a good fit, it'd probably be cheaper than custom.