I have owned stock, a bills pipe, a paul turner, a ct midrange (not the outlaw above) and now a Q 2.0.
If he does not want to cut the plastic the CT midrange was hands down the winner.  The bills was a grunt low end pipe not much better than stock.  the PT was quite good the CT I kept on and ran 15+ years.  It had more power every where than the PT. It was not a hi rpm pipe but it reved well.  a great all around pipe.  I can not speak to the CT outlaw pipe as I have never run one.  It is supose to rev about 500 rpms more then the ct midrange pipe and shift the powerband higher, but thats all i have heard.