Originally Posted by JetBlack5OC
The problem with your logic is the 4-series is a 3-series coupe. It is a 3-series chassis, with 3-series running gear, with two-doors.
Please people, don't let the number "4" trick you. It is marketing.
The 6-series is a completely different case. It is not a two-door 5-series.
No. The 5,6 and 7 use the same chassis and for the first time the 5 is based off of the 7, which explains why it is so big and heavy and also drives like a boat.