The BorgWarner 11-13 BMW 135i/335i B03 Turbocharger w/Exhaust Manifold is an aftermarket turbocharger system specifically designed for the BMW 135i and 335i. It features a BorgWarner B03 turbocharger with an exhaust manifold that is designed to increase engine power and efficiency. The turbocharger is constructed from high-quality materials and features a low-pressure compressor wheel that delivers improved air flow and boost response. The exhaust manifold is constructed from stainless steel and features a high-flow design that reduces exhaust backpressure and increases performance. This turbocharger system is designed to provide improved performance, power, and efficiency for the BMW 135i and 335i.