IMSA has made sweeping changes to the GT Daytona class Balance of Performance ahead of next weekend’s Sahlen’s Six Hours of The Glen.

Adjustments have been made to every single car in the class, largely power-related, in an effort to close the performance gap in the GT3-based category.

Both the Audi R8 LMS and Lamborghini Huracan GT3 have been given 2.0 mm (x2) larger air restrictors, while the Detroit class-winning Dodge Viper GT3-R has a reduced restrictor by 1.0 mm (x2), as well as a 0.8 mm reduction for the Aston Martin V12 Vantage GT3.

The BMW M6 GT3 will benefit with a slight increase in turbo boost pressures, although the Ferrari 488 GT3 has been pegged back with a boost reduction, following strong performances since its debut win at the Twelve Hours of Sebring.

While no power adjustments have been made to the Porsche 911 GT3 R, it will have a 15kg increase in minimum weight, bringing the car up to 1295 kg.

IMSA has not yet released any possible BoP changes to the Prototype or GT Le Mans classes ahead of the third round of the Tequila Patron North American Endurance Cup.