Dinan Free Flow Axle-Back Exhaust for 2016-2020 BMW 340i/440i D660-0055

Dinan Free Flow Axle-Back Exhaust - 2016-2020 BMW 340i/440iDinan engineers designed the F30 340i and F32 440i exhaust to improve exhaust flow by reducing back pressure, resulting in increased power output and a great sporty sound that is civilized when you want it to be, and pleasantly aggressive under hard acceleration. Not only is the tone improved but the additional burbles and pops that come with it are simply intoxicating. Dinan also incorporates a Helmholtz chamber design that reduces resonance or"drone" at low RPM.Features: More Power: +?6 HP @ 6600 RPM, + 5 LB-FT @ 6600 RPM Helmholtz chamber to reduce drone Enjoyably louder, sportier sound Twin 89mm (3.5") laser engraved, polished or ceramic black?exhaust tips 100% 304 stainless steel construction Uses the factory brackets and hangers for a factory-like fitment Specs: Brand Dinan Dinan Point Value 3 Emission Code 5 Height 11 Labor Time (Hours) 1.2 Length 48 Max HP Gain 6 @ 6600 RPM Max Torque (lb-ft) Gain 5 @ 66