Exhaust System 964 twin oval outlets 89x115mm oval (TÜV)- + 15 crank hp & + 12 crank torque - 2 ¾” (68.5 mm) diameter tubing (reduces thermal stress) - Weighs 20.0 lbs. (9.3 Kg) - Replaces OEM primary muffler. - T 304 stainless steel - 20% increase ...