The LaFerrari Prototype M4, internally known as F150 Muletto M4, was one of Ferrari’s early hybrid development mules built in 2011 on a modified 458 Italia chassis. It tested the hybrid V12 powertrain that would power the LaFerrari, producing nearly 800 horsepower on its own. Visually, it wore matte black paint, exposed rivets, oversized exhausts, and added cooling vents — all signs of its experimental purpose. Tested at Fiorano between 2011 and 2012, this prototype bridged the gap between conce

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