Brand: Forge Motorsport

Inlet Hose for BMW B58 (M140i, M240i, M340i, M440i)

Product code: FMINLH25

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More info Replacement BMW Panel Filter for B48/58 Engines - Read More

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Product Description

When looking at the B58 engine within the M140i/240i/340i/440i engine bay it’s clear that BMW had left some room for modification within the inlet tract, the sound resonator and accordion ribs cause significant turbulence to the airflow causing a detriment to the engine’s potential performance. By removing these, and replacing it with five-ply silicone construction you gain a host of performance upgrades, including:

  • Significant power gain of over 9bhp engine power and 7nm of torque.
  • Improved induction noise.
  • Multi ply silicone construction improves longevity of FMINLH25 over that of the OEM hose.
  • 5 ply silicone construction will be able to handle strain of engine mapping far better than OEM hose.
  • Fitting with no specialist tools in approximately half an hour.

Testing was completed using Performance Remap in Gloucester with their VTEC 4 wheel drive dynamometer, This was to ensure all our data has been achieved with results as accurately as possible by an independent tuner. The results below speak for themselves, also with the added benefit of being a very easy component to fit with no specialist tools this is superb, affordable modification for the BMW enthusiast.

From the dyno graph shown, performance gains can be expected from 4500RPM to the red line with +9BHP and +7NM of torque at peak RPM. Not only is FMINLH25 a functional improvement, but with it being available in black and red this product really helps to improve the aesthetics of the engine bay.

One major difference of FMINLH25 is the diameter of the hose at the airbox end. Usually this is 85mm diameter, however FMINLH25 is 90mm diameter, and uses a silicone reducer sleeve so that it fits the OEM airbox correctly. This increase of 5mm diameter allows the inlet hose to be used with a wider variety of airbox/intake systems while also increasing the volume and de-restricting the flow of the OEM part,



This product is a direct fit for the OEM part 13718601682 (just the turbo inlet to airbox section).

  • The hoses are suitable to be used with either modern long-life coolants, Organic Acid Technology coolants (O.A.T.) or air containing oil mist.
  • The construction of the hoses has been engineered to exceed that of the OEM fitments and will enhance any engine bay both technically and aesthetically.
  • Lifetime warranty.

Why not pair this with our Forge Motorsport replacement high flow panel filter (FMPAN-0172) if you are using the OEM airbox.

Complimentary Products


Please Note: In line with our policy to constantly review, revise, and improve our product range, the appearance of the product you receive may differ from the one advertised.

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Compatible Vehicles




Inlet Hose for BMW B58 (M140i, M240i, M340i, M440i)


Warranty Infomation

All Forge Motorsport products come with a limited lifetime warranty. All warranty claims must be accompanied by the original proof of purchase to enable us to help you. Failure to supply this proof will result in your claim or enquiry being denied.

For further information, please call our customer service team on +44(0)1452 380999 or email

Do not use aggressive (acidic) car cleaning products, particularly traffic film remover solutions or shampoos to clean your intercooler, radiator or oil cooler. The use of these products can damage Forge Motorsport cooling systems and invalidate your warranty. These are often found at car washes. A light, warm, soapy solution (free of harsh acidic cleaning compounds) should be used to clean you cooler and thoroughly rinsed away. We recommend that you should inspect your product on a regular basis for bent and/or crushed fins. Any bent fins should be carefully straightened to allow ambient air to pass through the core face. At the time of installing your Forge radiator, an approved coolant must be used and added to the coolant system. Be sure you never mix coolant and always use distilled water.



USA Deliveries

All Deliveries are sent via Fedex. We cannot guarantee delivery timelines as all orders are up to shipper schedules and routes.  Delivery fee is a Flat Rate of $20 fo all orders over $20. Orders below that value are costed out based on weight. Signature required may be added to your package. Orders can not be re-directed, held, or re-scheduled.

Shipping outside of the Lower 48- Duty Charge Information

All Forge products are sold with a Delivery Duty Unpaid (DDU) status and an import tariff may apply to your order. Customers will be contacted by the Customs and Excise authority in the destination country regarding payment prior to delivery, and it is important that correct contact telephone number and email information be submitted with the order to facilitate this part of the delivery process. 

Our shipping methods ensure safe and timely delivery of your new Forge products. For further information on cost and delivery times, please contact Forge using the email address if you require any more information. We reserve the right to change the delivery service and company at any time.

***Once a product has left our warehouse and is in the possession of the shipping company, any claims must be made directly with that shipper however we can assist with most cases.