Whether you have an existing M button or not, this small upgrade changes the entire look of your cockpit. If you don't have an M button on your steering wheel, you probably have a button you've never used before. So, replace it anyways! People have been saying it's one of the best and most subtle differences they've made. Installation take a few short minutes. Fitment guaranteed - Needs to be sport, M-Sport, or M3 wheel. In other words, it needs to have the rounder air bag. It does not fit the non sport steering wheel. Edges have been shaved to ensure proper fitment, so that it will not stick.