The Corvette C7.R has been slowed ahead of the start of official on-track activity for the 24 Hours of Le Mans, with the FIA confirming Friday Balance of Performance changes in the wake of last weekend’s Le Mans Test Day.

The GTE-Pro class Corvettes, which paced the test day, will start Free Practice on Wednesday with a 0.2 mm smaller air restrictor, which roughly equates to a five to ten horsepower decrease.

It is the only notable change to the BoP in the class, with the weight and power configurations from the Ford GT, Porsche 911 RSR, Ferrari 488 GTE and Aston Martin Vantage remaining unchanged.

Fuel capacities, however, have been adjusted for all GTE-Pro cars, in order to equalize refueling times and stint lengths at 35 seconds and 14 laps, respectively.

As a result, both the Ferrari and Aston Martin gain 3 liters, with 2-liter increases for the Corvette and Ford and 1 liter of additional capacity for Porsche.

Fuel capacity adjustments have also been made in GTE-Am for the 2016-spec Ferrari and Aston Martin, which both receive 4 additional liters.

However, the GTE-Am class Ferrari also gains a 0.03 increase in turbo boost pressures, across all power levels.

As was the case last year, the FIA reserves the right to make additional BoP changes at any time during race week, in the run-up to the next weekend’s race.