As a result, FIA Group 2 racing was introduced in 1965 for the 1966 season. It enjoyed good competitor participation, and was highlighted by the addition of New Zealand’s first circuit-racing Mustang.

Group 2 was run alongside the Allcomers, and was part of a bigger plan by MANZ to introduce wholesale changes for the 1967/1968 season. Group 2 was in widespread use throughout the world, so it made sense to go in that direction, but in the end, it was decided the highly stringent regulations might be a step too far for a nation that liked to explore its creativity. To that end, FIA Group 5 was adopted.

Group 5 allowed engine boring and stroking, wider wheels, upgraded brakes, provided they were from the same manufacturer, plus various modifications to the suspension. In many ways, it was the perfect middle ground between the lawless Allcomers, and tightly controlled Group 2.

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