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

The Dinan Cold Air Intake for the BMW G20 M340i, G22 M440i, and G42 M240i reworks the entire lower airbox, not just the lid, to house a filter 40% larger than the OEM unit while maximizing available engine bay volume. A secondary inlet was added after testing across multiple opening shapes, sizes, and locations to confirm the added air source does not raise intake air temperatures, the core failure mode of any open-air secondary inlet design. Dinan's testing confirmed their approach supplies additional cool air without that penalty, delivering a wider intake path and greater flow capacity with no heat soak trade-off.

Features:

+ Entire lower airbox redesigned and enlarged, not just the lid
+ 40% larger custom free-flowing filter for increased flow capacity
+ Secondary inlet validated to add cool air without raising intake temperatures
+ Tested across multiple shapes, sizes, and locations for optimized performance
+ Direct OEM fitment, no modification required
+ Fits BMW G20 M340i, G22 M440i, and G42 M240i with B58 engine