DINAN – Semi-Open Carbon Fibre Intake – BMW M240i / 340i / 440i (16–21)

Experience the full sound and performance potential of your B58-powered BMW with the Dinan Semi-Open Carbon Fibre Intake. Designed for drivers who crave more induction noise and presence without sacrificing power or refinement, this system builds upon the proven Dinan closed-box design with an added auditory port to release the intoxicating sounds of turbo spool and blow-off. When paired with the optional Dinan Turbo Inlet Pipe, the entire intake tract is upgraded for maximum flow, sound, and response.

Beyond the acoustic upgrade, the semi-open intake follows the same engineering principles that make Dinan intakes a benchmark in performance. The airbox volume is increased by 30% and the filter surface area by 34%, improving airflow efficiency and reducing strain on the turbocharger. The stock intake tube’s restrictive baffling and Helmholtz chamber are replaced with a smooth, full carbon-fibre intake pipe—eliminating turbulence for a clean, laminar flow path that enhances both horsepower and throttle response.

The result is a performance intake that delivers +15 HP and +13 lb-ft at 6000 RPM on a stock engine, with a refined, motorsport-inspired tone that elevates the driving experience. Made entirely from premium 2×2 gloss carbon fibre, the intake combines lightweight strength with timeless aesthetics, ensuring your engine bay looks as exceptional as it performs.

Features & Benefits:

• +15 HP / +13 lb-ft @ 6000 RPM (+13 WHP / +11 WTQ on stock tune)

• Semi-open design amplifies turbo spool and induction sound

• 30% larger airbox volume for increased airflow and efficiency

• 34% larger filter area (76.3 in² → 102.1 in²) for optimal flow

• Optimized carbon-fibre intake tube eliminates restrictions

• 8% larger air-mass-meter housing for precise, unrestricted airflow

• Optional Dinan Turbo Inlet Pipe (sold separately) enhances the full intake path

• Premium 2×2 carbon-fibre construction with UV-resistant clear coat

• Quick, direct bolt-on installation

• 50-State Emissions Legal: CARB EO D-176-56 (2019–2021 F2x/F3x M240i / 340i / 440i)

Fitment Table: