SARDINIA, Italy — As 21st-century Porsche 911s go, few hit peak analog quite so completely as the GT3 Touring. Free-breathing, naturally aspirated 4.0-liter flat-six? Check. Six-speed manual? Mandatory. In a world that’s gone nearly completely paddle-shifted, turbocharged, and computerized, the wingless $146,350 coupe was a laser-focused answer to the nagging question enthusiasts couldn’t stop asking.