We got behind the wheel of the all-new BMW M350, the M Performance replacement for the M340i, at BMW's secret test facility in Miramar. With the B58 inline-six making 437 HP, 443 PS, all-wheel drive, and a claimed 0-60 mph in about 4.1 seconds, this is the sharpest 3 Series BMW has ever built. In this first drive, BMW engineers walk us through everything that changed under the skin: new tire sizes (245 front, 275 rear), M Adaptive suspension exclusive to this trim, retuned dampers borrowed from the Neue Klasse, a stiffer chassis, and a reworked limited-slip differential. We also break down the new rear-wheel-drive drift mode arriving in 2027 via a software update, test launch control on track, and compare Sport, Sport Plus, and DSC-off behavior in real conditions. If you've been waiting to see how BMW improves on the M340i, this is your first real look at the car that might be the closest the 3 Series has ever gotten to an M3. 0:00 Intro 0:16 What's new: B58, AWD, 437 hp, 0-100 in...