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Designed to replace the standard E46 M3 (S54 engine) air intake system.

Based on the original CSL airbox (Plenum chamber) this product is highly popular.

The majority of customers purchase this airbox literally for the intake noise alone, it is truly fantastic. On top of the noise, throttle response, engine power and overall driveability of the car is vastly improved.

This is a three piece item incorporating the same diameter intake as the original but without the large butterfly assembly.

This item is supplied complete with intake snorkel and K&N air filter, You will also require “Alpha N” mapping.




  • Material: Carbon
  • Weight: 4kgs Approx
  • Colours: Carbon Weave
  • Includes snorkel
  • Price: £1395
  • Availability: Manufacture to distribution approx. 1 to 4 weeks. (Please contact us directly if you require parts by a specific date as we will always endeavour to meet requirements)


The latest version of the ever popular Geoff Steel replica carbon fibre, CSL airbox is here. The new design incorporates aluminium, CNC machined flanges where the snorkel meets the airbox, inlet trumpets now showing carbon fibre weave, much more rigid construction and a much higher quality cosmetic finish.

Manufactured from CNC machined moulds to produce a very high quality finish.

As all Geoff Steel Carbon products are bespoke hand laid pieces, you are advised that minor adjustments may be required at the time of installation.

Where holes are required, as standard we leave this blank, so on installation they can be drilled once in position.

Please note that to install this product on your car extra parts are required. Part numbers for these parts are provided upon purchase of the airbox. Additional cost for these parts from your BMW dealer are around £75 for manual gear boxed cars and £150 for SMG cars.

Due to the nature of the material used in all carbon fibre and fibreglass products, it is of upmost importance to not only store items correctly (i.e. weight/pressure spread evenly) but on receipt of the items fit them as soon as possible. Incorrect storage can lead to items becoming misshaped thus creating a problem when fitting.

If you are unsure about how to fit your Geoff Steel Carbon products, then please feel free to contact us directly (see Contact) for advice. If you are in the UK we can quote to fit the products, otherwise any competent car body shop would be able to undertake this task.


All Geoff Steel Carbon products are designed and manufactured for use on track or race cars only. Any use on highways is at own risk.

For track/race cars we can also manufacture with no breather ports for when separate engine breather catch tanks are to be used.

We have used our CSL replica airbox on many of our own race cars, some running modified engines up to 450bhp.


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G S Fibre Limited | Station Road | Kirton Lindsey | Gainsborough | DN21 4BD | UK

Company no. 09242565

Registered office address
G G Steel, Station Road, Kirton Lindsey, North Lincolnshire, DN21 4BD

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We will have reduced opening times over Christmas/New Years, we will be back to normal on 2nd January 2019. See our Blog for details Dismiss