i tried the non fouler trick when i put on my test pipe and i havent gotten a code yet and ive had my test pipe on for a few months now. so heres a couple pics of what u should get and do.
u need this....

i got mine at advanced autoparts u should be able to get this at any parts store
and u do this....
on the 5th gen ludes u have to push the heat shield thats on the body of the car a lil up towards the car to get it to fit perfect use like a hammer or something but thats exactly how i did it and havent got a code yet so if ur goin catless i recommend this