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

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 — a BMW Roundel badge in place of the ///M V8 plaque.

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 536/08; 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
• 2-Year manufacturer warranty

Vehicle Applications

• BMW E90 M3 (S65)
• BMW E92 / E93 M3 (S65)

Installation Note

OEM ///M and V8 badges are optional and are not included with this intake system. The Roundel badge is supplied as standard on this version.

Alternative Style

• Karbonius E9X M3 (S65) Carbon Inlet Plenum and Intake System (identical performance; ///M V8 plaque in place of Roundel badge)

Recommended Upgrades

• Karbonius E9X M3 (S65) Carbon Plenum Heat Shield Kit
• Karbonius E9X M3 Carbon Front Intake Ducts

Notes

• Designed and manufactured in Spain by Karbonius Composites under ISO 9001 standards
• Professional installation recommended
• It is the customer's responsibility to check local laws to ensure legality when using this product on public roads and highways
• View emissions compliance notice