The GT3 format is moving further away from the production cars every year (this is the way any production-based racing goes if it survives long enough) so nowadays they're not modified from stock, but rather built from the ground-up to a formula and then balanced on weight and power (via intake restrictors)
GT3 prides itself on the diversity of manufacturers, so they're willing to let a newcomer in even if it's Bentley, even if in stock form they weigh more than full-size cars and some SUVs
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