DINAN Cold Air Intake - BMW M240i/M340i/M440i (20-24)

DINAN – Cold Air Intake – BMW M240i / M340i / M440i (20–24)

Unlock the true potential of your B58-powered BMW with the Dinan PEX Cold Air Intake — engineered to deliver sharper throttle response, aggressive turbo sound, and proven horsepower gains. Designed as a cost-effective alternative to Dinan’s carbon fiber intake, this PEX version provides the same performance and acoustic benefits in a more understated OEM-like finish.

The factory airbox on the G2x / G4x Mx40i models restricts airflow and muffles the turbo’s natural sound through an integrated resonator. Dinan’s redesigned PEX intake corrects this with a semi-open airbox that flows 58% more airthan stock, improving both power and responsiveness while enhancing sound without introducing excessive heat soak.

Through extensive testing, Dinan engineers optimized the secondary open-air inlet to increase airflow volume without raising intake temperatures — even during repeated high-load runs. The enlarged lower airbox houses a 40% larger high-flow filter, delivering consistent gains of +9 WHP and +8 lb-ft of torque on a stock vehicle.

While more affordable than the carbon fiber version, the high-heat-resistant PEX construction maintains a refined factory aesthetic that integrates seamlessly into the engine bay. The result is an intake that looks OEM, sounds exhilarating, and performs like a true performance upgrade.

Features & Benefits:

• +9 WHP / +8 lb-ft torque gains on a stock vehicle

• 58% more airflow vs. factory intake

• High-heat deflection PEX construction with OEM appearance

• 60% larger airbox volume and 40% larger filter area (82 in² → 115 in²)

• Improved throttle response and sharper acceleration

• Louder, sportier turbo sound with audible spool and blow-off noise

• Compatible with all G2x / G4x Mx40i models (with or without factory strut braces)

• Quick and easy installation — direct fit replacement
  

Fitment Table