Initially, Ford envisioned just two engines for the new Mustang: 2.3-liter turbocharged EcoBoost four-cylinder, mainly for European and Asian buyers; 5-liter V-8, mainly for North American buyers, to continue Mustang's muscular reputation.
But Ford realized a big draw has been Mustang's affordable starting price, incompatible with the pricey EcoBoost engine. So partway through development, the car was re-engineered to accept Ford's 3.7-liter V-6 as the base engine.
But the new rear suspension was so much better than the front suspension that engineers pressed hard for a new front suspension, too. It turned out to be an easy sale — just six key elements in the power-point presentation made clear how badly the front and rear suspensions were mis-matched. Global product chief Raj Nair gave a prompt OK, despite the cost in time and money.