On the Mustang I believe the mod was standard on the Shelby cars and may well have been homologated I don't know but if so i would have thought the mod on a Notchback was doubtful from the factory. Its the same as the Guilstrad mod on the 1st gen Camaro (not required on the 2nd gen like I race as the factory did it for you) but I bet most of the 'legal' cars have this modification. Its all about lowering the top wishbone inner mounting points and is not easy on the camaro as the frame has to be cut and shut. The object is to give more camber gain during cornering.
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