an all-wheel drive Subaru Impreza developed by Cusco won in Sepang. An open top car, Renault Sport Spider, made a one-off participation in 1997, also with lack of success. Hybrid cars first raced in the GT300 class in 2012, when apr introduced their Toyota Prius apr GT, and Team Mugen fielded a Honda CR-Z GT. Both cars were heavily modified from their production counterparts. The Prius was powered by a 3.4 liter V8 LMP1 engine, which worked in concert with production Hybrid Synergy Drive components; the CR-Z utilized a 2.8 liter V6 LMP2 engine and a 50 kW Zytek electric motor. Both the CR-Z and Prius were mid-engined, differing from their front-engined road-going counterparts; this resulted in the CR-Z's withdrawal after the 2015 season, as new regulations for 2016 stipulated that GT300 cars' engines were to be located in the same position as in their production counterparts. However, apr took advantage of a loophole in the regulations to continue to race their mid-engine Prius until 2018, when the team was required to build a new, front-engine Prius. The development of GT300 cars is much more regulated than that of their GT500 counterparts; the GTA works with the Stephane Ratel Organisation to balance the performance of all GT300 cars via technical adjustments in order to create close racing. While the GT3 cars in the class are closely related to production cars, the JAF-GT machines differ from production vehicles to a greater degree, and in the case of the Mother Chassis cars, share little more than a badge and exterior styling with their road-going counterparts. While engine outputs are at a lower level than the GT500 cars, the GT300 cars still post competitive times and races are relatively tight when combined with GT500 traffic. As it is becoming increasingly more difficult for GT500 cars to overtake GT300s, the GTA may review the speed difference between the two classes in the future, especially if the pace of the GT300 cars continues to increase. Cars GT300 specifications Engine displacement: Free Aspiration: Naturally-aspirated and single or twin-turbocharged Number of cylinders: Minimum 4 but not exceeding 10 cylinders Allowed engine shape: Flat, Inline and V Gearbox: 5 or 6-speed paddle shift gearbox Power output: Various Fuel: 102 RON unleaded gasoline Fuel delivery: Free (direct and indirect multi-point electronic injection) Steering: Power-assisted rack and pinion Circuits Bold denotes a current Super GT track. Italic denotes a former