OF COURSE, M3's most outstanding feature is its engine, which with a specific output of 78kW per litre is among the most efficiently powerful naturally aspirated engines currently available. In combination with a sequential manual gearbox, which is no longer unique to BMW but remains the most sophisticated system available, M3 delivers supercar levels of acceleration. M3's 50:50 weight distribution also provides its rigid chassis with outstanding poise and balance, while BMW's active M differential is another of M3's stand-out technologies.