BMW 3 Series (G20 / G21) Carbon Fiber Semi-Closed Cold Air Intake System | M340i – B58 3.0L Turbo (2019–Present)

Unleash the performance of your BMW M340i (G20 Sedan, G21 Touring, G22 Coupe) with our Carbon Fiber Semi-Closed Cold Air Intake System, designed for the B58 3.0L turbocharged inline-six. Built from premium lightweight carbon fiber, this intake blends motorsport-inspired styling with high thermal resistance. The woven carbon finish not only keeps weight to a minimum but also complements the M340i’s sporty, aggressive character with an engine bay upgrade that looks as good as it performs. This system is engineered as a semi-closed intake, offering the raw airflow of an open design while protecting the filter from excessive engine bay heat. By reusing the factory turbo inlet, it ensures OEM reliability while connecting through a shorter reinforced hose, which reduces turbulence and provides a more direct path to the turbo. The result is faster spool, improved throttle response, and cooler intake temps compared to the stock airbox. Expect real-world improvements: Sharper throttle response