 The turbo configuration is currently twin-turbocharged that mandated since 2014 and producing the turbo boost level pressure range restricted to depending on track shape.American turbocharger company BorgWarner Inc. currently supplies exclusive turbocharger kits including wastegate for all IndyCar Series cars from 2014 season onwards using an EFR7163 model.Previously BorgWarner EFR9180 (single) was used exclusively by Honda-powered cars while BorgWarner EFR6758 (twin) were used exclusively by Chevrolet and Lotus (2012) powered cars.