all gtlm cars bar the ferrari 488 gte had the size of their fuel tanks adjusted. the chevrolet corvette's c7.r's top speed was lowered through rear wing angles alterations by two degrees, while the ford gt's angles were increased by three degrees. the porsche 911 rsrs performance was lowered as its fuel restrictors were reduced in size by . in gtd, the acura nsx gt3 lost in weight and the mercedes-amg was made heavier. turbocharger adjustments were made to the audi r8 lms, lamborghini huracán, and the bmw m6 cars.