Yesterday we took our M4 & Z4M out to Buttonwillow Raceway for a track day hosted by Speed District. The turnout was a mostly BMW crowd, especially the new F8X M3s & M4s. The on-track performance of our mostly stock M4 really blew us away; we ran it super hard, non-stop, all day and it never had a single issue. Plus, driving on the recently repaved track was just a euphoric experience. We had a ton of fun out there, and we really loved seeing so many of our customers putting their BMWs to proper use. Here are some photos from throughout the day. Enjoy!