Cold Carbon Fiber Semi-Open Air Intake

The Dinan Carbon Fiber Cold Air Intake is engineered to replace the restrictive stock intake system found in the BMW M240i, M340i, and M440i models (G2x/G42 chassis). BMW's original design incorporates a basic panel filter and an intake resonator to quiet turbo and intake noises, which performance enthusiasts often wish to hear. This Dinan system addresses those shortcomings by providing a semi-open intake that flows significantly more air, improving top-end power and throttle response. The design focuses on maximizing airflow through an enlarged lower box and a larger, custom free-flowing filter, boasting a 40% increase in filter area (from 82 to 115 sq in). To further enhance flow without increasing intake air temperatures, Dinan conducted extensive testing on a secondary, patterned air inlet. This design ensures a balance of increased air volume and optimal temperatures, regardless of driving conditions. The result is an intake system that outflows the factory unit by 58% or more. This intake not only enhances performance but also adds a sporty aesthetic with its immaculate carbon fiber construction. It reveals more of the turbo spool and blow-off valve sounds, offering a more engaging auditory experience compared to fully sealed factory systems. Installation is described as quick and easy. Key performance gains include maximum increases of +9 WHP and +8 ft-lbs of torque @ 6500 RPM on a stock vehicle. The system is compatible with all G2x Mx40i models, whether they are equipped with factory bracing or not. The product is emissions-legal under EPA guidelines, though it is not legal for sale or use in California, with 50-state compliance pending CARB approval.