Originally Posted by 99gtstang

99-04 easy pass with the sensors off. My 99 passed for four years in a row with the predator tuner.... I have been looking for a way to pass my 07 before I go all out. I have a local dyno shop that said for $500 they can make mine pass with O/R pipe and LT'S BUT.... i cannot justify it. LT's DYNO tune for 1K + ......I am just going to do a O/R Pipe with stock headers and swap once a year at emissions time. Most shops will over look the cats for a small fee. Just need to know someone.