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You may find that the predator tune has already turned the rear 02's off in the tune. I had a diablo predator on my 2004 and the rear 02 sensors were already turned of in the tune because i had and o/r x pipe and it never tripped the rear 02 sensor codes. Also a friend of mine has a 2006 gt with th c&l racer cai and the c&l racer tuneon diablo predator and his rear 02 sensors were already off in the racers tune as he has and o/r x-pipe and has never tripped rear 02 codes. But i could be wrong though!