Dinan Carbon Fiber Cold Air Intake - BMW G20 / G22 / G42 M240i / M340i / M440i

The Dinan Carbon Fiber Cold Air Intake for the B58-powered G-Chassis lineup serves the M240i coupe, M340i sedan, and M440i coupe on a unified intake design built around a fully redesigned lower airbox and a filter 40% larger than OEM. Unlike systems that upgrade only the lid, Dinan reworked the entire lower box to maximize available engine bay volume before adding a secondary inlet. That inlet was validated through systematic testing across multiple opening shapes and sizes, each evaluated to confirm the added air source does not raise intake temperatures. The result is a cold air intake that delivers more air, cooler air, through a wider path.

Features:

+ Entire lower airbox redesigned and enlarged, not just the lid
+ 40% larger custom free-flowing filter vs OEM
+ Secondary inlet validated across multiple shapes and sizes to confirm zero heat soak
+ Carbon fiber construction for lightweight, thermally insulating airbox
+ Unified fitment across G20, G22, and G42 M-Performance variants
+ Fits BMW G20 M340i, G22 M440i, and G42 M240i with B58 engine