If you look at the Shelby Mustang first gen performance trait, you'll be notice when this car getting newer, it getting slower and heavier. When the first time GT350 came out, it has 138 mph with 0-60 mph around 6 sec less. It improved on Shelby GT350R which has 148 mph with 0-60 mph in 5.4 sec. When GT500 came out in 1967, it has max speed 150 mph with 3.25 with 0-60 mph in 6 sec and later the KR version has same full speed but has 5.6 sec 0-60 mph. And then, 69 to 70, they only reach 140-145 mph with 0-60 mph in high 6 sec. And the newer 69 and 70 has worse handling compared to 65 to 68 cars. Only the fifth gen Mustang that has increased performance trait both in tracks and in speed.
