487 HP Stage 1 Performance Controller | BMW M240i/M340i/M440i

Love this controller. I’ve only been able to use it up to 93 octane but even at 91 it is a noticeable difference. Waiting for their e85 kit to come out!

This is a good stage 1 product . Easy to install , but there is a need for specific installations in an 2021+ M440i … the video that is available is not for that model . The car definitely feels more powerful after 2nd gear . I have yet to test it on and open road , but so far I am very happy with it

Significant increase in torque in the ranges that I’ve been able to check it out on the street. The car accelerates quickly and smoothly. Minor issues with the installation due to the difference between my engine and the one in the installation video had to be overcome.