


Dundon Motorsports stands behind our products with a 30-day love it guarantee. We are confident in the quality and performance of their upgrades, but if for any reason they don't meet your standards or help you push your performance on track, you can send them back within 30 days.
Some products are built locally and made to order. Typical lead time for welded components (mufflers, headers) is about 7 business days after purchase. In rare cases timelines may change—we’ll notify you by phone.
Using science and engineering to increase performance is what we do. The Dundon 981/991 3.8L Intake Runners are no exception. Through careful design of the intake runner geometry we were able to add 30+ peak wheel horsepower on top of our already potent race headers and tune. By extending the torque curve we increased power substantially all the way to redline, over 100whp gains at 7850rpm over both our headers/tune and stock.
Left Graph is Torque at the Wheels
Right Graph is HP at the Wheels
Bottom Line is Stock GT4
Middle Lines are GT4 with Race Headers and Dundon Pro Tune
Top Lines are GT4 with Race Headers, Tune, Intake Runners (with IPD Plenum/Carrera S Plenum and GT3 TB), GT3 Muffler Over axle pipes, and GT3 Muffler
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