Header with catalytic bypass (for use with OEM exhaust)

Our header/catalytics for the GT3 is aimed at those who are looking for more torque in the mid range, a rich, deep exhaust growl and most importantly durability._x000B__x000B_- high durability for track use._x000B_- for cars with OEM side mufflers _x000B_- Manifold without catalytics._x000B__x000B_By reducing the back pressure up to 20 (15kw) crank hp and 13 (15NM) crank torque can be achieved on a 997.1 / 997.2 GT3/RS._x000B__x000B_Fits: GT3 RS, 4L, 368kW (10-), 3.8L, 331kW (10-), GT3, 320kW (10-), 3.6L, 305kW (07-09)