after testing, imsa adjusted the balance of performance for the second time in all categories after analysing data of the car's performances. the cadillac dpi-v.rs had their fuel capacity enlarged by along with their refuelling restrictors by but their air restrictors were . the size of the fuel tanks in the acura arx-05 and the nissan onroak dpis were increased by and with the size of both car's fuel restrictors increased by . nissan onroak dpis boost pressure was increased to peak at 7,100 rpm. the mazda rt24-ps were lighter. its rev limit was raised to 8,600 rpm and its air restrictor was lengthened by . the acura, nissan and mazda dpis gurney flaps were adjusted for aerodynamic purposes.