The BMW M3 series features some of the most celebrated performance-oriented sedans to have hit the American roads. The German automaker releases several new updates with each generation of M3, and the same stands true for the sixth-generation 2021 BMW M3. The flagship sedan gets a design facelift, along with significant performance upgrades. Continuing on the subject, we’re sharing a brief overview of the 2021 M3. Read on. Design Available as a compact four-door sedan,…