The Cadillac DPi-V.R has been slowed even further, with power and aero changes having been made in the latest round of Balance of Performance adjustments prior to next weekend’s Chevrolet Sports Car Classic at Detroit.

The Cadillac, which has been undefeated in IMSA WeatherTech SportsCar Championship competition so far this year, has received a 0.6mm smaller air restrictor, 2-liter reduction in fuel capacity as well numerous reductions in aero.

The car’s previously permitted 30mm body gurney has been cut to a maximum of 8mm, with the maximum rear wing angle now at 12 degrees, instead of the previously permitted 17 degrees.

Additionally, the maximum angle for the rear wing flap is now set to 23.8 degrees, with the rear wing flap gurney reduced from 1800 to 1200mm.

Other changes in the Prototype class include an increase in low-end turbo boost for the Mazda RT24-P, as well as a 1-liter fuel capacity increase for both the Mazda and the Nissan Onroak DPi, the latter which has also received a 0.5mm reduction in its refueling restrictor.

Weight, restrictor and fuel capacity changes, meanwhile, have been made in GT Daytona, with the class championship-leading Mercedes-AMG GT3 getting a 20kg weight increase and 0.5mm reduction in air restrictor following its recent streak of success.

Additionally, the Porsche 911 GT3 R will now be 10kg heavier, while fuel capacity increases have been made to both the Lamborghini Huracan GT3 (+2 liters) and Audi R8 LMS (+1 liter).