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
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
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