M3 SEATS four adults in comfort, five at a stretch. Front passengers get front and head airbag protection, while all outboard passengers get side airbag, adjustable head restraint and lap-sash seatbelt protection. The centre rear occupant sits on a hump between the outboard passengers' buckets and must use a lap-only seatbelt. There's relatively good rear leg and headroom, the rear seatback is split-folding and useful rear armrests grace the outboard positions. But there are no cupholders and the outward-opening rear windows lack functionality.