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Doug Thorley Headers performance Mid Y-pipes for your vehicle deliver the final touch of performance and sound you're looking for. These performance Y-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 Y-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. All are 100% American made and backed by Doug Thorley's 5 year limited warranty to original purchaser.