Nissan Fairlady Z 432 'Manx'

An old sports car that had been passed on for generations somehow survived a nuclear holocaust. The coupe-turned-rust bucket was eventually discovered by a group of armed resistance. They actually confiscated it from cannibal raiders when they launched a counter attack on their outposts. They somehow thought of a solution against wasteland raiders seeing the old Datsun as a weapon - through rebuilding its engine, modified its chassis with upgraded frames and armed it with suitable armaments. Their signature style was painting the nose of the car and putting fear onto their enemies. The car itself was light and fast (at least by armored tank standards) but it was also unstable in high speed and cornering - the resistance called it the 'Manx'.

Picture taken from Forza Motorsport 7