Doug Thorley Headers 89228 performance B-pipes for your 2007-2012 Toyota FJ Cruiser deliver the final touch of performance and sound you're looking for. These performance B-pipes are installed between your header outlet and your exhaust system. They replace your factory catalytic convertors with straight thru resonators, producing noticable gains in horsepower and torque output. These B-pipes are NOT LEGAL for use on pollution controlled vehicles, and are for off-road racing use only. They are manufactured using heavy duty 16GA aluminzed steel tubing, and super flat 3/8 inch flanges. APPLICATION SPECIFICS: 2007-2012 Toyota FJ Cruiser, 4.0L V6, 2/4WD.