Dinan Cold Air Intake — M240i / 340i / 440i (2015–2021)

The core principle is simple but effective: pulling cooler, denser air from outside the engine bay gives your turbocharged inline-six more to work with on every combustion cycle. The result is a noticeably sharper throttle response and a more linear, satisfying power delivery that makes the B58's already strong output feel even more accessible. It's an upgrade you feel immediately, not just on a dyno sheet.

Installation is straightforward thanks to the model-specific design—there's no cutting, adapting, or guesswork involved. Every component is built to OEM tolerances, which means you're not trading long-term reliability for short-term performance gains. Boost leaks, sensor errors, and fitment headaches are non-issues here.

For M240i, 340i, and 440i owners looking for a well-pedigreed entry point into performance upgrades, this intake is the logical first move. It integrates cleanly with other Dinan hardware if you're planning a more comprehensive build, and it's designed to remain emissions-compliant—so you can drive it with confidence on the street and the track.