Among the possibilities to
reduce the problems created by the
restrictor plates is cutting two inches off the rear spoiler and raising the front
air dam two inches.
The R8 Grand - Am features an engine with its power
reduced from 470 PS (346 kW; 464 bhp) to 450 PS (331 kW; 444 bhp) via an
air restrictor and the engine electronics, a
reduced fuel tank capacity of 83.3 litres, three - part rims for wheels and suspension, and deactivated anti-lock system and traction control (NASCAR / Grand - Am does not permit either traction control nor anti-lock brakes).