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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 GT3 owners and 25whp for 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.
991 GT3 Before and After Dyno
991 GT3 RS, 911R Before and After Dyno