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BMW M140i Air Intake

5.0 / 5 · 13 reviews

FAQ

Do I need a tune for the intake to add real power?
An intake mainly improves airflow, and the clearer gains come once a tune uses that extra breathing. On its own it adds little power, so plan a tune if power is the goal.
Will an open filter suffer heat soak in slow traffic?
An exposed filter can draw warmer bay air when the car sits in traffic, which softens gains. A shielded or enclosed design keeps intake temperatures lower in stop-start driving.
Does it fit alongside a downpipe or charge pipe already fitted?
An intake generally works with other bolt-ons, since each targets a different part of the system. Confirm clearance around parts you already run so nothing fouls.
Does the intake reuse the factory air sensor?
Most intakes relocate the original air sensor into the new tube so readings stay correct. Confirm the intake has the right port so your sensor transfers cleanly.
Does an intake alone add meaningful power on the B58?
Gains from an intake by itself are modest, with response and sound changing more than outright power. The bigger difference comes when it supports a tune.
Will fitting an intake affect my warranty?
Intake changes can affect warranty coverage on related components, depending on your terms. Keep the original parts so you can refit them if needed.

BMW M140i Air Intake

The M140i hides a 3.0 straight-six that wants to breathe, and the factory airbox is one of the first things standing in its way. A BMW M140i air intake opens that path, replacing the sealed, silenced box with a high-flow filter and a smoother route to the turbo. On a car already this eager, letting it inhale freely sharpens the throttle and, just as importantly, uncorks a sound the standard setup keeps politely muted.

Letting the Six Breathe

The stock intake is shaped around noise limits and cost rather than airflow, so it draws through a dense paper element and a maze of baffles. Clearing that lets the turbo pull air with far less effort. An M140i intake will not rewrite the dyno on its own, but it removes a genuine restriction, and on a tuned car it helps the whole setup make the most of every pound of boost the engine is asked to run.

That Induction Roar

For plenty of owners, the real reason is the noise. A BMW M140i intake lets you actually hear the turbo work: the deep gulp of induction under load, and the flutter and whoosh as boost vents between shifts. It is a mechanical, faintly addictive soundtrack that the closed factory box hides almost entirely. Fit one, and the car feels quicker before the figures even change, simply because you are suddenly part of what the engine is doing. It is the kind of upgrade you notice on every drive, not just at full throttle, which is a large part of why intakes are so often the first thing owners fit.

Open or Enclosed

This is the one real trade-off to weigh:

  • An open cone filter breathes freely and sounds the loudest, but it sits in warm engine-bay air, so heat soak can dull gains at a standstill

  • An enclosed or shielded design, in effect an M140i cold air intake, boxes the filter away from that heat and feeds it cooler, denser air for steadier temperatures

Which one suits you comes down to whether you chase the loudest sound or the most consistent numbers on a warm day.

How Much It Really Adds

It is worth being honest here. On an otherwise stock car, the gain is modest and mostly about sound and response. Where an M140i air intake really pays off is alongside a tune and the other supporting mods, because the software can only use the air the hardware is willing to pass. Building it into a wider BMW M140i performance parts plan, rather than fitting it in isolation, is what turns a great noise into real, usable pace.

Fitment and a Driveway Install

Fitting is among the easier jobs on the car, usually an hour with basic hand tools. The kit drops in where the airbox sat, reusing the mass-air sensor, and most designs are a straight bolt-in with no cutting. Confirm the kit is listed for the B58 M140i rather than the N55 M135i, since the two do not share an intake, and check whether a heat shield is included or offered as a separate part. It is also worth clearing any stored fault after fitting and letting the car relearn, so the new airflow reads cleanly from the first drive.