Shelby GT350 R
Shelby started building Mustangs in 1965 as fire-breathing machines that brought Ford much-needed recognition and performance credentials. But the cars responsible for their racing success were 34 “R” models produced only in 1965. They were sold to privateers and racing teams all over America and the world. These cars were not street-legal and were used purely for racing purposes, which they did exceptionally well (via Motor Trend).
The GT350 R had numerous modifications and was lighter, faster, and sharper than the regular GT350. The same 289 V8 powered the R version as the regular Shelby GT350, but it had close to 400 HP and numerous racing modifications. The car was light, well-balanced, and proved to be extremely fast, winning multiple races in America, Europe and South America.