Dinan's free flow Axle-Back exhaust for the 135i Coupe and Convertible improves 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 harder acceleration. 100% stainless steel construction and exacting specifications ensure that the system fits correctly using the factory hangers and will resist corrosion for years to come. The design reduces overall weight as well and features 3.5'' polished stainless, or ceramic black, tips for a tasteful high-performance look.. Dinan 08-13 BMW 135i/135is (E82/E88) Free Flow Axleback Exhaust System - Black Tips. Dual 3.5" laser engraved, polished or ceramic black exhaust tips. Uses the factory brackets and hangers for a factory-like fitment. Dinan Free Flow Axle-Back Exhaust - 2008-2013 BMW 135i/135is. Drone abatement technologies used to reduce cabin resonance. More Power: + 6 HP @ 6600 RPM, + 5 LB-FT @ 6600 RPM. Stainless Steel - Black Tips - E82/E88. 100% 304 stainless steel construction. Enjoyably louder, sportier sound. FREEFLOW EXHAUST E8X 135 BLACK. Lighter than stock. Axle-Back Exhaust. DIN ESK

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