The 911R diffuser in place. You can see the vortex generating strakes here. We think the GT3 RS should come with this part stock!
Here is a bottom view of the 911R diffuser in place. You can see how the exhaust for the rear-mounted engine interferes with the ability to build an even more effective diffuser. You can also see the plastic gap fillers that make the GT3 RS virtually a flat bottom.
The rear diffuser is pretty impressive looking with the GT3 RS’s wide body and wall to wall rubber. The 21×12″ wheels have some of the widest rubber found on any production car, a 325/30-21!
So the 911R rear diffuser was a neat looking, hopefully effective, easy to install and even a relatively inexpensive part. We still think a car like this should have come with one from the factory. It is a genuine Porsche part, and it is easily reversible, so we feel that it cannot devalue the car.
This part will also fit on a 991.1 GT3, the 991.2 GT3 has a diffuser already.
Stay tuned as we dream up other things to do with Project GT3 RS.