It is made of high - strength steel and, depending on the engine variant, has been connected to the newly developed floor side members by means of special supporting tubes. (topspeed.com)
This was the result of a large contact area between the longitudinal members and the floor assembly, numerous cross-members in the front and rear of the body and between the A-pillars and the use of a multi-part floor assembly with a central tunnel and side members in thick sheet steel. (mercedes-benz.com)
All versions of the W222's audio system has a new feature called Frontbass, which innovatively places the woofers in the firewall of the car, thus using the 40 litre space in the cross member and side member as a resonance chamber. (paultan.org)