991.1/991.2 GT3, GT3RS, 911R, Cup,



So here is my final review about these Dundon headers: - First of all, these headers are beautiful.... they look so good that I just want to hang them on my wall. A quality product! Comes packaged nicely with a set of K&N filters. - Install by the shop was smooth like a breeze, no fitment issues at all. Took around 2... read more

Kareem, Bahrain
GT4 Race Headers

Intake Kit Dual Cone Airbox, 93mm Throttle Body and Plenum 991.2 GT3


Click on a photo to enlarge.

Help your 991.2 GT3 BREATHE!!!

We found in our exhaust development and testing of the 991.2 GT3 and RS that they are intake limited both through the factory airfilter box and throught the 82mm Throttle body.  A bit of history.  The Bosch 82mm Throttle body is the largest Bosch makes and was used as far back as the 996 GT3 which made 380hp.  The Air filter box used on the 991.2 GT3 and the 991.2 GT3RS originally showed up on the 2013 991 Carrera S which makes 350hp.  Your 991.2 GT3 is rated at 500hp, so you can see just from these numbers that the intake side of things is a constriction.  

In our testing we found the the stock airbox to be about a 0.2-0.3psi pressure loss and the 82mm throttle body to be about 0.3-0.4psi of pressure loss.  Naturally aspirated engines make power from the force of the atmosphere pushing air into the engine, so every 0.1 psi helps!  Our combo of 93mm Throttle Body and Dual Cone Airbox reduces the losses to under 0.1psi.


Dual Cone Airbox for 991.2 GT3

Stock Filter Area :1.77 ft2

Reverse Dual Cone Filter Area: 4.96 ft2

280% more than stock.

More filter area means slower air speeds through the filters and less pressure drop across the filter element


93mm Throttle Body has  28.6% more area than the 82mm throttle body.  



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