K&N High-Flow Air Filter BMW M140i M240i 340i & 440i (B58 3.0L)

K&N High-Flow Panel Air Filter for BMW M140i, M240i & 440i (B58 3.0L)

Part No: 33-3051  Quantity Required: 1 (Filters are sold individually)

Your BMW M140i, M240i or 440i is already one of the best all-round performance cars on the road. The B58 3.0-litre turbo straight-six is smooth, brutally effective and responds brilliantly to tuning. But from the factory, it’s forced to breathe through a restrictive, disposable paper air filter that was never designed with enthusiasts in mind.

It’s time to let that engine breathe properly. The K&N High-Flow Panel Air Filter is the perfect “first mod” for any B58-powered F Series BMW. It’s a direct, drop-in replacement for the original filter, transforming the way your engine inhales while being engineered to be the last air filter you’ll ever need to buy for the car.

Using K&N’s multi-layered, oiled cotton gauze construction, this filter offers significantly more airflow than the stock paper element, while still providing excellent filtration. The result is sharper throttle response, improved mid-range punch and a more purposeful induction sound every time you lean on the throttle.

Unlike the standard paper filter, this K&N element is fully washable and reusable. When it becomes dirty, you simply clean it with the appropriate K&N service kit, re-oil it and refit – no more throwing money away on disposable filters at every service.

Key Features & Benefits

• Unlocks Performance: Increased airflow to your B58 engine, supporting gains in horsepower and torque compared to the restrictive factory paper filter.

• Sharper Throttle Response: Noticeably more eager response and improved turbo spool as the engine can draw air more freely.

• Reusable for Life: Fully washable and reusable design – clean, re-oil and refit instead of replacing, saving money over the lifetime of the vehicle.

• Direct Drop-In Replacement: Designed to fit directly into the OEM airbox on M140i, M240i and 440i models with no cutting, drilling or extra parts required.

• Excellent Engine Protection: Multi-layer oiled cotton gauze media offers outstanding filtration, helping to protect your engine from harmful contaminants.

• Ideal Supporting Mod for Tuning: Perfect partner for an ECU remap or other performance upgrades on the B58 platform, removing a key restriction in the intake system.

MSL Recommends

Your B58 engine uses a single panel filter in the factory airbox, so you only need one (1) of these filters per car.

We highly recommend this upgrade as:

• A simple, cost-effective performance enhancement even on a completely stock car.

• A supporting modification for Stage 1 or Stage 2 tuning, allowing the turbo to make the most of any additional boost and fuelling.

For long-term use, we also suggest keeping a K&N cleaning and re-oiling kit on hand so you can service the filter correctly and keep it performing at its best.

Full Vehicle Fitment List

This K&N High-Flow Panel Air Filter (33-3051) is suitable for the following BMW F Series models equipped with the B58 3.0-litre turbocharged straight-six and standard airbox:

• BMW M140i / M140i xDrive – F20 / F21 (2016–2019)

• BMW M240i / M240i xDrive – F22 Coupé, F23 Convertible (2016–2020)

• BMW 440i / 440i xDrive – F32 Coupé (2016–2020)

• BMW 440i / 440i xDrive – F33 Convertible (2016–2020)

• BMW 440i / 440i xDrive – F36 Gran Coupé (2016–2020)

If you’re unsure whether this is the correct filter for your car, just get in touch with your registration or VIN and we’ll be happy to confirm compatibility.