Ive done it. I did not use an xpipe. If anyone has questions email me dgo610@gmail.com
I absolutely hated it due to noise. I am now running a Camaro SS muffler with a bullet muffler in the I-pipe to further quiet it. My car sounds like a throaty porsche and it's quiet on the highway. I love it.
Yea I had 2 1/2's on my car, h pipe and borla XR1's dumped before the axle. Best sound that has ever came out of a 3.8 IMO. Look on putfile and streetfire there are some videos of it, dyno, idle etc.