Dinan engineers designed the BMW 328i/428i 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. Like all Dinan exhausts our 328i/428i Free Flow Axle-Back Exhaust is engineered to reduce low-RPM drone so the cabin of the vehicle is still intimate and not drowned in an excessively loud tone.. The system is built with ease in mind and utilizes a simple bolt-on installation with included mounting hardware. It is made from 100% 16-gauge 304 stainless steel and will resist corrosion for years to come. The design features twin 70 mm ceramic black or polished and laser engraved exhaust tips for a tasteful high-performance look that yields a maximum performance gain of 4 horsepower and 3 ft-lbs of torque.. Dinan 12-16 BMW 328i/428i (F30/F31/F32/F33) Free Flow Axleback Exhaust System - Black Tips. Twin 70mm (2.75") laser engraved, polished or ceramic black exhaust tips. Uses the factory brackets and hangers for a factory-like fitment. The factory computer-controlled exhaust valve is eliminated.. Dinan Free Flow Axle-Back Exhaust - 2012-2016 BMW 328i/428i. Drone abatement technologies used to reduce cabin resonance. More Power: + 4 HP @ 6600 RPM, + 3 LB-FT @ 6600 RPM. Stainless Steel - Black Tips - F30/F31/F32/F33. 100% 304 stainless steel construction. FREEFLOW EXHAUST F3X 328I 428I BLACK. Enjoyably louder, sportier sound. Axle-Back Exhaust. DIN ESK

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