981 GT4/Spyder



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

981 GT4/Spyder Cobb Accessport with Dundon Pro Tune


Click on a photo to enlarge.

Dundon Motorsports is happy to provide the Cobb Accessport for the 981 GT4/Spyder.  We're Cobb Pro Tuners and have developed a great tune for the Dundon GT4/Spyder Race Headers.


GT4 Dundon Pro Tune

Gains Over Stock including GT4/Spyder Race Headers and Dundon Pro Tune:

3600 RPM: +50 wtq +32whp
5000 RPM: +55 wtq, +52whp
5800 RPM: +24 wtq, +26whp
6500 RPM: +30 wtq, +36whp
7500 RPM: +30 wtq, +43whp

377.1whp on our dyno works out to 438.8 BHP




scroll up