I'm very happy with it. In terms of affecting the cars outright performance, as such, I cant really say till I've been on the track, strip or Dyno with it - but Ill eat my hat if the car isn't measurably quicker in all situations. On a fast back road run for 150 miles it felts quicker for sure but... read more
Mark, Australia 991 GT3 Race Headers
991.1 and 991.2 GT3, GT3RS, 911R Race Headers with Flapped Side Delete
Constructed from 321SS tuned length stepped headers and flapped side connector, the exhaust combination offers a 40whp increase for GT3 owners and 25whp for GT3RS owners with no ecu flash required and no drone.
Click on a photo to enlarge.
Race Headers are for Non US or for racing vehicles.
Constructed from 321SS tuned length stepped headers and flapped side connector, the exhaust combination offers a 40whp increase for 991.1 GT3 owners and 25whp for 991.1 GT3RS owners with no ecu flash required. By understanding exhaust flow and resonance tuning, Dundon Motorsports developed this combination. The use of the the OEM center muffler and flaps allow for drone free, quiet cruising and a glorious porsche roar when on the throttle! This setup is bolt on and can be selected with or without the exhaust flaps.
Weight of the system is lighter than stock by far. Stock is 86 lbs, the weight of the Race Headers and stock GT3 muffler flaps is 36lbs This is complete header flanges to the exhaust tips including ALL hardware, clamps, straps etc, a savings of 50lbs!
991 GT3 Before and After Dyno
991 GT3 RS, 911R Before and After Dyno