Karbonius Composites Carbon Airbox for E30 BMW 3-Series / M3 CSL

Karbonius Composites E30 S54 Carbon Airbox is purpose-built for E30 chassis with S54 swaps and manufactured in Spain from 100% prepreg carbon fiber by qualified technicians under an ISO 9001 quality management system. Inspired by the legendary E46 M3 CSL induction character, the unit is modified for precise E30 fitment; however, a smaller brake booster (E21 320i or E30 iX) is recommended to avoid contact. Due to chassis constraints, this version omits the CSL’s front inner ducting that typically routes fresh air from the E46 CSL bumper. Each piece is individually numbered to verify origin and authenticity.

Features

• 2×2 carbon weave, gloss finish (other finishes available on request)
• Noticeable power gains
• Aerodynamically optimized design
• CNC-machined aluminum components
• Stainless steel fasteners
• Reinforced at all critical points, screws, and connectors
• Distinctive induction sound
• Aluminum threaded inserts
• 100% prepreg carbon fiber
• Autoclave-cured construction
• Individually numbered, exclusive piece
• Aggressive, motorsport appearance
• 2-year warranty

What’s Included

• Airbox
• M power decal
• Certificate of authenticity

Applications

• BMW 316i: E30 (1987-1994)
• BMW 318i: E30 (1982-1994)
• BMW 320i: E30 (1982-1992)
• BMW 323i: E30 (1982-1985)
• BMW 325i: E30 (1985-1993)
• BMW M3 CSL: E30 (1986-1991)

Notes

• Instructions are not included, professional installation is highly recommended
• You may need extra clamps or hoses. Depending on model year, you can often reuse the stock parts, or buy new ones from a BMW dealer. Check the listed reference numbers to confirm.

About Karbonius Composites

Karbonius Composites prioritizes uncompromising quality. Every component is produced in Spain from 100% pre-preg carbon fiber and autoclave-cured, using meticulous hand layup by highly qualified technicians under rigorous quality controls. Confident in its manufacturing standards, Karbonius provides a 2-year warranty against manufacturing defects. With extensive composites experience and a global base of satisfied customers, the brand is committed to delivering exceptional products and customer satisfaction. Each piece is individually numbered to verify origin and authenticity.