Header Set for 991 GT3 with Cat Bypass

- + 20 crank hp & + 14 crank torque. - Cat Bypass - 2 tubing (50 mm) with Motorsport merge collector. - Weighs 14.0 lbs. (6.38 Kg). - German V2A - X5CrNi18-10 - 1.4301 stainless steel for improved durability. - Works with OEM sealing rings and clamps. See below for part numbers. - Made in Germany. - Reduces thermal load and backpressure to for more torque in the mid-range and Hp on the top end. Be sure to add new clamps and sealing rings to your order. 2 Qty. clamps are needed, they are part # 99711133690 and 2 Qty. sealing rings are needed, they are part # 98011156100. Our latest development for the GT3 is aimed at those who race their cars and are looking for more torque in the mid-range, more horsepower on the top end and a rich, deep exhaust growl. Please Note: Software is necessary to turn off the check engine light (CEL) light produced with catalytic bypass.