The pair of Mazda Prototypes will head into next weekend’s Continental Tire Road Race Showcase with added weight and less power, following IMSA’s latest round of Balance of Performance adjustments.

IMSA confirmed on Thursday that the Mazda has been given a 10kg increase in minimum weight, and a slight reduction in turbo boost pressures, across all RPMs, for the upcoming IMSA WeatherTech SportsCar Championship round.

While no other changes have been made to cars in the Prototype class, a handful of cars have been given BoP adjustments across other classes.

It includes the GT Le Mans class Ferrari 488 GTE, which receives a 10kg increase in minimum weight but an increase in turbo boost, which will likely offset the weight change.

The Ferrari has also been given a 1 liter increase in fuel capacity, while the Porsche 911 RSR gets 2 additional liters of fuel, but more importantly a 0.3mm increase in air restrictor, one race after its weight adjustment and tire compound change.

In GT Daytona, the BMW M6 GT3 will be 15kg heavier in Road America, while the Dodge Viper GT3-R will run with a 1.0mm larger air restrictor.

The Continental Tire Road Race Showcase is set for Aug. 5-7.