Just run straight pipes!!
http://www.youtube.com/watch?v=M1VI-rTaUmU
I'm kidding the PSE is an awesome system.
At one time I took an OEM muffler and hacked into it a bypass. in a sense it was a PSE that was stuck open. There is a video here:
http://www.youtube.com/watch?v=EEPv_l6GBfw
Don't laugh at the tips they did not come out right and that was the main reason I changed mufflers to my current setup.