BMW 135i 335i Racing Downpipe

The fastest way to upgrade your BMW 135i or 335i engine performance is replacing the factory restrictive downpipe to a high flow straight through 3 inch downpipe system. By replacing your factory downpipe with ProTuningLab 3 inch downpipe, you will feel better engine and throttle response, which make the car more fun to drive. This allows the turbos to effectively evacuate exhaust from the turbine housing, which decreases engine pumping losses as well as improve turbo responsiveness.