Signature Werks G8X Rear 17" Brake Conversion KitFactory G8X M2 M3 M4 rear brakes can only allow down to 18" diameter wheels. This makes it harder to allow larger sidewall tires. With the help of Signature Werks, we've developed a perfect option. We do not want to sacrifice the performance of the braking capabilities. So, we've integrated ZL1 calipers to the rear brake with new rotors as well as a dedicated electronic parking brake. Everything functions like OEM. There is no programming needed. Once