The use of high - strength and extra-high-strength multi-phase steel as well as tailored blanks —
customized precision components for specific applications — maximizes the degree of stability at an optimized weight.
The use of ultra high - strength multiphase steels and
customized precision components increases torsional rigidity by 40 %, while making the 4 Series Convertible up to 44 lbs.
The use of high - and ultra-high-strength multi-phase steels and tailored blanks,
customized precision components for specific applications, maximizes the body's strength.