The Karbonius E46 M3 Carbon Vented Fender Set is a fast, effective way to shed weight while transforming the stance and aerodynamics of the E46 M3. Inspired by the Porsche 991 GT3 RS aesthetic, the vented design was a radical concept for a road car when introduced but pairs beautifully with any track-focused E46 M3 build.

Based on OEM M3 dimensions, the Karbonius fenders add 15 mm of width per side for additional tire clearance, with integrated carbon vented louvers that evacuate accumulated air from the wheel arch — reducing air pressure and increasing downforce at speed.

Each fender is manufactured from 100% prepreg carbon fiber, cured in mold and autoclave at Karbonius' facility in Spain, and individually numbered for authenticity. At only 980 grams per fender, the set delivers a combined 2 kg weight reduction over the factory steel fenders.

What's Included

• Left and right carbon vented fenders
• Integrated carbon vented louvers
• Front bumper guides for improved bumper-to-fender fitment
• Numbered certificate of authenticity

Product Details

• Weight: 980 g per fender (approx. 2 kg total reduction vs. OEM)
• Additional 15 mm width per side for wider tire clearance
• Integrated vented louvers reduce wheel arch pressure and increase downforce
• 100% prepreg carbon fiber construction
• Autoclave-cured for strength and finish quality
• GT3 RS-inspired aesthetic
• Individually numbered for authenticity
• 2-Year manufacturer warranty

Vehicle Applications

• BMW E46 M3

Installation Note

Includes front bumper guides to modify bumper fitment to better match the widened fender profile. Click here for the official Karbonius installation instructions (PDF).

Recommended Upgrades

• Karbonius E46 M3 Carbon Vented Hood
• Karbonius E46 M3 CSL Carbon Front Splitter Set
• Karbonius E46 M3 Carbon Front Bumper Canard Set

Notes

• Designed and manufactured in Spain by Karbonius Composites
• Professional installation and paint/finish work recommended