I guess there is such a thing as being too good.
The Cadillac DPi-V.R was so fast during testing at Daytona in preparation for the IMSA WeatherTech SportsCar Championship opener, that race officials ordered smaller air-restrictors placed on the engine, as reported by motorsport.com.
The 5.5 litre Cadillac engine was given 31.6mm restrictors, 0.6mm smaller than previously used, after it apparently dominated the testing. Reports say the Cadillac was the fastest car in each of the eight testing sessions. And while the Caddy was tamped down, other entries were given some room to improve performance. Mazda was allowed to reduce weight by at least 15kg and an increase of 300rpm. Nissan was allowed to increase its boost pressure for their Onroak DPis. BMW, which is making its class debut at Daytona, was given a 10kg weight reduction and more power boost.
Officials also equaled out the fuel capacities for all the entries to make sure the cars had similar ranges.