GT4 Rear Diffuser Since they are installed above

Since they are installed above the springs

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Modifies your existing trunk

Raises to full height in 6 seconds

We get a lot more mid range torque and a little extra 15whp up top

GT4 Rear Diffuser Since they are installed aboveInstallation Instructions GT4 Rear Diffuser Overview: A properly designed rear diffuser not only looks great on your car, but is a very efficient way to add downforce. Using CFD software and 3D scans, the DBJ rear diffuser creates a completely flat bottom from the oil pan back to the rear of the car. This flat bottom helps reduce unwanted drag and produces downforce at the rear of the car. Although designed specifically for the 981 GT4, the DBJ