As per the 400 Thunder Competitors Guide, the current rule relating to class swapping for performance classes reads:

Competitors in these classes will only be permitted a maximum of one class swap per vehicle/bike per season. Further to this, a class swap can only be made after an engine combination change or transmission type change that would necessitate a class change.

After submissions from the 400 Thunder Sportsman Commissions, and subsequent approval from APDR, the decision has been made to alter this rule only for the remainder of the 2019-2021 Super Season to allow for a maximum of two class swaps during this season only.