Available to Order
Not sure which one? Ask us to confirm fitment first →For UK customers, prices include VAT, customs and delivery unless checkout states otherwise. Outside the UK, shipping is shown at checkout and local customs and taxes remain your responsibility.
Some products are made to order, imported or custom built. If timing matters, contact us before ordering and we will confirm the expected delivery timeframe.
Send the vehicle, engine and current setup if you want us to confirm the exact application before checkout.
| Manufacturer | MST Performance |
| Product Type | Cold air intake system |
| SKU | MST-BW-X301 |
| Material | Aluminium intake pipework |
| Vehicle Applications | BMW X3 M40i G01 3.0T B58 2021+; BMW X4 M40i G02 3.0T B58 2021+ |
| Included Items | All fittings for a direct OEM-replacement install |
The X3 M40i is a 3.0T B58 straight six wearing sensible SUV clothes, and its restrictive standard air box keeps the disguise complete. This MST Performance cold air intake system replaces that box with precision-engineered aluminium pipework, built to speed airflow into the turbo with minimal turbulence. The result is an M Performance SUV that finally sounds the part under load while staying quiet on the school run. Fits X3 M40i (G01) and X4 M40i (G02) from 2021 on, with all fittings for a direct OEM-replacement install.
The B58 responds to breathing work wherever it is fitted, and MST apply their usual design brief here: accelerate the air, cut turbulence, remove restriction, build with top-quality components. On the M40i pair the reward is twofold - a cleaner intake route feeding the six, and an induction note that separates the M Performance cars from the rest of the range the moment you accelerate.
For the 3.0T B58 in the X3 M40i (G01) and X4 M40i (G02), 2021 on. The 2.0T B48 X3/X4 uses the MST B48 X3/X4 kit, and X3M Competition cars run the S58 - a different engine again. Confirm your model badge and the part number before ordering.
| Manufacturer | MST Performance |
| Product Type | Cold air intake system |
| SKU | MST-BW-X301 |
| Material | Aluminium intake pipework |
| Vehicle Applications | BMW X3 M40i G01 3.0T B58 2021+; BMW X4 M40i G02 3.0T B58 2021+ |
| Included Items | All fittings for a direct OEM-replacement install |
No - the X3M runs the S58 engine. This kit is for the M40i models with the 3.0T B58 from 2021 on.
A stronger, cleaner induction note under load in place of the muted standard air box, with refinement essentially unchanged at a cruise.
For UK customers, prices include VAT, customs and delivery unless checkout states otherwise. For customers outside the UK, local customs and taxes remain your responsibility, and shipping is shown at checkout. If a shipping option is not available, email us and we will prepare a tailored quote.
Many of the products we sell are made to order, imported or custom built, so a lead time may apply. If you need a part urgently, contact us before ordering and we will confirm the expected delivery timeframe and process.
Model year, engine, drivetrain, hardware and existing modifications can all change what fits. Check the applications and supplier notes above, or send us your exact vehicle and setup before ordering.
Send us your vehicle, year, current setup and any fitting date, event, trip or deadline before ordering. We will help check fitment, product choice and timing.
