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I ran my car around for a week after installing the o/r h pipe before sending my tuner back to Brent. He turned off the O2 sensors and tweeked the tune a bit. Along with not having the service engine soon light on, the car does run a little bit better now. From my experience, I would recommend having your tuner tweeked for the off road pipe.
Oh, you may want to invest in some ear plugs........Your neighbors are gonna need them.