Dinan Free Flow Axle-Back Exhaust System with Polished Tips for BMW 440i (F33/F36) 2017-2020

The Dinan Free Flow Axle-Back Exhaust for the BMW F33/F36 440i is engineered to enhance exhaust flow by reducing back pressure, which leads to increased power output and an exhilarating sporty sound. The system delivers an extra +6 HP and +5 lb-ft of torque at 6600 RPM, ensuring noticeable performance improvements. The exhaust tone is civilized during normal driving but becomes aggressively sporty under hard acceleration, with intoxicating burbles and pops adding to the driving experience.

To keep the cabin quiet and free from excessive noise, Dinan incorporates a Helmholtz chamber design that minimizes low-RPM drone. The system is meticulously built to provide a perfect fit, using the factory hangers and brackets, making installation straightforward.

Made from 100% 16-gauge 304 stainless steel, the exhaust is designed to resist corrosion for years, maintaining both durability and performance. The system also features twin 89mm (3.5") polished or ceramic black exhaust tips, which provide a tasteful and high-performance aesthetic. The factory computer-controlled exhaust valve is eliminated, allowing the system to deliver a consistent sporty sound.

Key Features:

• Power Gains: +6 HP and +5 lb-ft of torque at 6600 RPM
• Drone Reduction: Helmholtz chamber design reduces low-RPM resonance for a quiet cabin
• Sound: Louder, sportier sound with rich burbles and pops under acceleration
• Exhaust Tips: Twin 89mm (3.5") laser-engraved, polished or ceramic black tips for a high-performance look
• Material: 100% 304 stainless steel construction for long-term durability
• Fitment: Uses factory brackets and hangers for a seamless, easy installation