The 2016 SEMA Show settled an old argument when the Ford Mustang was voted Hottest Coupe over Chevrolet’s Camaro, even though Chevy brought the bigger display. But the car that actually stole attention that year wasn’t from either factory — it was a privateer rally driver’s twin-turbo 1965 Mustang making more than 1,400 horsepower. Here’s what happened at the show that’s still a reference point for builders a decade later.