Agency Power's 335i downpipes are designed to improve your BMW's performance greatly enhancin exhaust flow. The polished 304 stainless steel pipes connect to the headers with 3" diameter openings and V band flanges. The larger diameter design will improve exhaust flow, keep boost pressure up and provide improved throttle response. A more aggressive tone will be emitted from your engine as well! These down pipe eliminate the factory catalytic converters for maximum exhaust flow. Each down pipe has 2 oxygen sensor locations for an easy installation. These are a must have to squeeze maximum performance from your BMW 335.