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BMW M240i Air Intake

5.0 / 5 · 13 reviews

FAQ

Is this a sealed airbox or an open filter design?
Intakes come as sealed boxes that shield the filter from heat, or open filters that breathe freely. Sealed designs resist heat soak better, while open ones favor sound and airflow.
Does the intake need recalibration to read airflow correctly?
Some intakes change how air is measured, so the car may need software adjustment to read it accurately. Check whether your setup expects any calibration after fitting.
Does an intake change the M240i's induction sound?
Yes, most intakes add a more noticeable induction and turbo sound under acceleration. Open designs are the loudest, while enclosed ones stay more subtle.
Is an intake a sensible first modification?
An intake is a common first step because it is straightforward and improves how the car breathes. Just remember the real power gains usually need a tune to follow.
How often does the filter need cleaning?
Cleaning depends on the filter type and how dusty your driving is, not a fixed interval. Inspect it periodically and service it when it looks dirty.
Will an intake sharpen throttle response?
Freer intake airflow can make throttle response feel a little crisper. The change is subtle alone but adds to the overall feel with other upgrades.

BMW M240i Air Intake

An engine only makes what it can breathe, and on the M240i, the standard airbox quietly limits the inhale side. A BMW M240i air intake replaces that sealed, muffled box with a high-flow filter and a cleaner path to the turbo, so the B58 draws air with far less effort. On a coupe built around feel, the reward is a throttle that answers a touch sooner and a car that finally sounds like it is working with you rather than politely hiding the effort.

The Inlet Half of the Equation

It helps to picture airflow tuning as two halves: getting air in, and getting exhaust out. The intake owns the first. An M240i intake is the natural partner to a freer exhaust, and the two are usually planned together as part of a wider build, since there is little point uncorking one end while the other stays choked. Sort both, and the engine breathes cleanly all the way from filter to tailpipe. 

Throttle That Wakes Up

What you notice first is sharper response. With the restriction gone, the turbo draws freely and picks up a fraction quicker off part throttle, so the car feels more alert in exactly the moments a keen driver lives in: rolling onto the power, short-shifting through town, squeezing out of a junction. A BMW M240i intake also lets more induction sound through, a deeper, harder note the closed factory box keeps tucked away.

What a Good One Is Made Of

Not every kit is built to the same standard, and a few details are worth checking:

  • A mandrel-bent aluminium or roto-moulded pipe with a smooth inner bore

  • Quality silicone couplers and stainless clamps, not thin rubber and cable ties

  • A washable, re-oilable filter you clean rather than throw away

  • A correctly sized adapter so the mass-air sensor keeps reading accurately

  • A heat shield or sealed lid where the design is meant to draw cooler air

Solid materials are what keep the gains and the sound honest over years, not just on the day it is fitted.

Where the Gains Actually Come From

It pays to stay realistic. On an otherwise stock car, an M240i air intake mostly adds response and sound, with only a small change on the dyno. Its real value appears once a tune and supporting mods are in place, because the software can only use the air the hardware is willing to pass. Fitted as part of a considered plan rather than on its own, it stops being just a pleasant noise and becomes a working part of the setup.

Sized for the B58 Coupe

Fitment is straightforward but specific. Confirm the kit is listed for the B58 M240i rather than the N55 M235i, because the earlier car runs a different intake that will not carry across. Most kits are a straight bolt-in that reuses the factory sensor and takes roughly an hour with simple hand tools. Route the new pipe clear of hot components, make sure every joint is fully seated, and the car is ready to breathe.