Girodisc Porsche GT4 Clubsport Rear Rotors (380x30) 2021 Without this adaptor

Without this adaptor

The front large air inlet receives outside high-pressure flow from the front of the grille and acts as a ram air design for the majority of the air supply

No permanent vehicle modifications required

adding more flow

such as decking the block or boring and honing cylinder walls

Girodisc Porsche GT4 Clubsport Rear Rotors (380x30) 2021 Without this adaptorThe Girodisc system is a direct replacement for the OE cup car disc. The disc will bolt directly to the car and work with OE calipers perfectly. The central hat section of our rotor is made from strictly U. S. sourced 6061 T6 aircraft specification aluminum. The disc is made from our own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc. The rotor utilizes a curved vane design, developed in racing to act