I got the XForce cat back system a couple of weeks ago. I am very happy with the result. Didn't go the DP due to cel issues. Will get to that soon. I will take a vid so you can hear what it sounds like and post it up soon. It was $800 for the cat back and I couldn't be stuffed installing it so got a local guy I use for bits and pieces to install. They had it to my guy in less than 24hrs, so can't complain about shipping time. When I called XForce directly to ask some questions they were incredibly helpful. Almost stock sound at cruise but a really nice tone when I give it some. My 2 cents worth...
Corksport SRI and TIP, 2XS LED lighting-: interior, parkers, fog lights and number plate lights, painted brake calipers (black), cPE REM, Cobb AP, Corksport front strut brace, Corksport rear sway bar, Autotech HPFP internals, Xforce cat back exhaust, Xforce DP, HPFP etune.