CTS Turbo Intake Kit for M140/M240/340/440 B58 3.0L

Unlock effortless airflow and real-world gains on your BMW straight-six with this high-flow induction upgrade, designed specifically for B58-powered M140i, M240i, 340i and 440i models. It replaces the restrictive factory airbox with a free-breathing set-up that feeds your turbo with cool, clean air for sharper response, stronger mid-range pull and an addictive soundtrack.

Why enthusiasts choose this performance intake

At the heart of the kit is an oversized 6 inch bellmouth filter with a velocity stack that smooths incoming air before it reaches a mandrel-bent 3.5 inch aluminium tube. The result is a straight, unobstructed path to the compressor inlet for reduced pressure drop and improved turbo efficiency. A CNC-machined MAP sensor mount keeps the sensor in the correct factory orientation, ensuring stable readings and dependable drivability.

Dual heat shields with edge seals isolate the filter from engine bay temperatures, helping combat heat soak and keeping intake temps consistent on the road and track. The stealthy black powder-coated finish looks OEM-plus while resisting corrosion and grime.

Proven performance and sound

Expect measurable improvements without calibration. Customers typically see gains of around 12 to 20 bhp depending on fuel quality and elevation. On the road you will notice crisper throttle response, faster spool and a deeper, more purposeful induction note when you lean on the throttle, with refined manners during light cruising.

What you get

• Washable, reusable high-flow filter with 6 inch bellmouth velocity stack
• 3.5 inch smooth-bore aluminium intake tube to the turbo inlet
• CNC-machined MAP sensor boss in factory alignment
• Two formed heat shields with rubber edging for an effective seal
• Quality clamps and couplers for a secure, air-tight install
• Durable black powder-coat for an OEM-style look

Fitment

• BMW M140i F20 F21
• BMW M240i F22 F23
• BMW 340i F30 F31
• BMW 440i F32 F33 F36
• Compatible with left-hand drive and right-hand drive
• Works on rear-wheel drive and xDrive variants

Why buy from MJ Modifications

We have installed this set-up on numerous customer B58 cars and feedback has been outstanding. Owners love the improved punch, the richer turbo sound and the factory-level fit and finish. If you want it fitted by people who know these cars, we offer professional installation at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote.

Key benefits at a glance

• Direct replacement for the stock airbox with no ECU tuning required
• Noticeable gains in power and torque across the rev range
• Reduced restriction and smoother airflow to the compressor
• Lower intake temperatures thanks to twin heat shielding
• Enhanced turbo whistle and induction noise under load
• Designed to look right at home in the engine bay

Searching for BMW M140i induction kit, M240i cold air intake, 340i intake upgrade, 440i performance intake, F30 F31 F32 F33 F36 B58 air intake, turbo inlet pipe, high flow air filter or BMW B58 tuning parts You have found the solution that blends genuine performance with everyday reliability.