Karbonius E9X M3 (S65) Carbon Inlet Plenum and Intake System - Roundel Style

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$4,125.00
$4,125.00
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The Karbonius E9X M3 (S65) Carbon Inlet Plenum and Intake System — Roundel Style is the most complete carbon intake solution available for BMW's naturally aspirated V8, now featuring a BMW Roundel badge in place of the ///M V8 plaque. Where BMW never developed a carbon plenum for the S65 as they did for the S54 CSL, Karbonius engineered a full carbon fiber intake system — plenum, elbow, airbox cover, and air filter — to improve engine efficiency, unlock a dramatic induction sound, and transform the engine bay aesthetic.

Designed by Karbonius' in-house engineering team using modern 2D and 3D flow analysis, every component has been redesigned to optimize airflow into the engine while minimizing turbulence inside the airbox — delivering measurable power gains alongside the visual and auditory upgrades. The Roundel Style version is performance-identical to the ///M V8 version; the distinction is purely aesthetic.

Each piece is manufactured from 100% prepreg carbon fiber and autoclave-cured in Spain under ISO 9001 quality standards, combining motorsport-grade construction with authenticity and long-term durability.

What's Included

  • Carbon inlet plenum
  • Carbon elbow
  • Carbon airbox cover
  • BMC high-flow air filter (BMC FB536/08; verify compatibility with your filter cartridge)
  • Numbered certificate of authenticity

Product Details

  • Karbonius intake (airbox + elbow): 3,635 g vs. OEM 6,677 g — approximately 3 kg weight savings
  • Power gains: +9 HP with airbox alone; +32 HP with Karbonius airbox + Alpha-N mapping
  • Optimized internal geometry for improved airflow and reduced turbulence
  • Dramatic S65 V8 induction sound
  • BMW Roundel badge (as opposed to ///M V8 plaque on the standard version)
  • 100% prepreg carbon fiber construction
  • Autoclave-cured for strength and finish quality
  • Individually numbered for authenticity
Karbonius E9X M3 (S65) Carbon Inlet Plenum and Intake System - Roundel Style

$4,125.00

Does it come with a warranty?

Parts are covered by the manufacturer's warranty where one is offered. If something goes wrong, contact us and we'll help you with the claim.

What happens if I don't like it?

New, uninstalled parts in their original packaging can be returned within 30 days of delivery. Suspension components (coilovers, springs and dampers), wheel spacers and batteries can't be returned, and a restocking fee applies to approved returns. See our refund policy for details.

How fast is shipping?

In-stock orders usually ship within 1–3 business days. Many parts ship directly from the manufacturer or distributor. Orders over $200 ship free with standard shipping, and faster UPS and USPS options are available at checkout. See our shipping policy.

What's the returns policy?

You have 30 days after receiving your item to request a return. Parts must be new, uninstalled and in their original packaging. Contact us first to start a return. Full details are in our refund policy.

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