 While the bodyshell and suspension layout of the production vehicle is retained in a TCR car, and many models use a production gearbox, certain accommodations are made for the stresses of the racetrack including upgraded brakes and aerodynamics.Competition vehicles are subject to Balance of Performance (or BoP) adjustments to ensure close racing between different vehicles.The project to develop the TCR specification was spearheaded by former World Touring Car Championship manager Marciello Lotti.