Quick view Procharger Procharger 2015-2020 Mustang GT350 Stage 2 Compare $9,343.95 FORD MUSTANG SHELBY GT350 AND GT-350R 5.2L SUPERCHARGER SYSTEMS. UP TO 1,100+ HP! The Mustang Shelby GT350’s 5.2L DOHC engine has a flat-plane crankshaft that gives the car an engine scream that is the envy of sports cars world-wide, and its... Choose Options Choose Options