Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap – S54 ITB Carbon Intake Plenum, E46 M3 CSL Sound
Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap – S54 ITB Carbon Intake Plenum, E46 M3 CSL Sound
Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap – S54 ITB Carbon Intake Plenum, E46 M3 CSL Sound
Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap – S54 ITB Carbon Intake Plenum, E46 M3 CSL Sound
Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap – S54 ITB Carbon Intake Plenum, E46 M3 CSL Sound
Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap – S54 ITB Carbon Intake Plenum, E46 M3 CSL Sound
Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap – S54 ITB Carbon Intake Plenum, E46 M3 CSL Sound
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  • Load image into Gallery viewer, Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap – S54 ITB Carbon Intake Plenum, E46 M3 CSL Sound
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Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap – S54 ITB Carbon Intake Plenum, E46 M3 CSL Sound

£1,949.99
£1,949.99
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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

Karbonius Carbon Fibre CSL-Style Airbox for BMW E30 S54 Swap

Unlock the iconic E46 M3 CSL induction sound and sharper throttle response on your BMW E30 S54 swap with the Karbonius carbon fibre airbox. Handcrafted in Spain using 100% prepreg carbon fibre and cured in an autoclave under ISO 9001 quality standards, this CSL-style intake delivers lightweight performance, exceptional build quality and that addictive S54 ITB roar.

We have run this airbox on our own S54 builds and customer cars. Feedback is consistently outstanding for sound quality, drivability and craftsmanship. If you want the ultimate CSL sound and a premium carbon intake solution for your E30 S54 conversion, this is the one to choose.

Why choose the Karbonius CSL airbox for your S54 swap

  • Legendary CSL induction noise from the S54’s individual throttle bodies
  • Appreciable gains in power and throttle response with a free-flowing carbon plenum
  • 100% prepreg carbon fibre, autoclave cured for strength, rigidity and light weight
  • Aerodynamic, aggressive appearance with a factory-plus finish
  • CNC machined aluminium components and aluminium threads
  • Stainless steel hardware and reinforcement at all key stress points
  • Each piece is individually numbered with a certificate of authenticity
  • Backed by a 2 year manufacturer warranty against defects

E30 S54 swap specific design

The standard E46 CSL airbox does not correctly clear the E30 chassis when using an S54 engine. Karbonius have refined the rear section near the brake servo for proper E30 fitment and day-to-day drivability.

  • Modified rear section for E30 chassis clearance near the servo
  • Front inner canalisation duct is not included on this version
  • Recommendation: fit a smaller brake booster to prevent any contact in tight engine bays

Kit contents

  • Karbonius carbon fibre airbox
  • Certificate of authenticity
  • M Power sticker

Air filter is not included and is available separately.

Fitment

  • BMW E30 with S54 engine swap

If you are working on a BMW Z3 M S54 project, please contact us to confirm compatibility before ordering.

Installation

  • Installation difficulty: Medium
  • No cutting or drilling of the chassis required
  • Several OEM components may need to be changed during installation

Want it fitted professionally and correctly first time? Nforcd offer installation services in Warwickshire. Request a fitting quote at Sales@nforcd.com.

Quality and warranty

Manufactured in Spain by qualified technicians under ISO 9001 Management Quality System rules. Every piece is 100% prepreg carbon fibre, autoclave cured and individually numbered to guarantee authenticity. Includes a 2 year warranty against manufacturing defects.

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