You can look at the problem a bit mathematically and say that you have the set of all possible production cars which are transformed into the set of all possible race cars given the rules and how the teams implement/take advantage of the rules.
The problem is that while you don't necessarily want a set of rules which allow a team to take just any car and make it into one just as fast as one based on a million-dollar supercar, it's also desirable if the set of production cars that can be made into potentially winning race cars is not restricted to just supercar clones nearly indistinguishable from each other. You want the set of optimum production cars to have a range of members, not just one. But you also don't want rules which allow you to take any old production car and make something that can hit the target GT lap times.
OTOH, the rules may also have a wider range of "optimum" production cars associated with them, but only one manufacturer may be producing a car near an optimum or even actively *trying* to produce a car near an optimum. So you may have to skew your rules to take into account what the set of actual production cars are instead of all theoretical production cars.
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