Developed under the internal codename F32, the 4 - series is based on the same high strength steel platform structure and uses the same aluminum intensive underpinnings as the latest 3 - series sedan. (autoweek.com)
While they rely on the same basic high - strength steel platform structure as the standard 3 - and 4 - series, the new M3 and M4 receive a largely bespoke chassis with reduced ride height and noticeably wider tracks, which have increased by 1.3 inches up front and 0.7 inch at the rear to 62.2 inches and 63.1 inches respectively to provide BMW's latest in a long line of M cars with a sporting stance. (autoweek.com)
Removable stainless steel platform can be hand washed. (amazon.com)