2024 X3 M40i Downpipe And Tune. I have a 2019 m40i in colorado, where we don’t have 93 octane gas and i’m wondering what can i do to tune it up. Curious about moding the b58 and have heard some things about unlocking the ecu.

They’re a pita to install and unless you live in socal the tune is a pretty big risk. In this video, you’ll see.