GT3 cars go through homologation, part of that process is BOP (Balance of performance) which aims to ensure a level playing field of cars.
For example Aston is running a 6L V12 with 2 small restrictors (from memory 32mm), BMW running a 4.4 V8 with no restrictors at all from what I've heard. Guess if a car didn't have much grip they'd allow it more grunt with the aim of the same laptimes but not 100% sure on the process.
Downside of the Aston is fuel consumption, it properly guzzles it!
For example Aston is running a 6L V12 with 2 small restrictors (from memory 32mm), BMW running a 4.4 V8 with no restrictors at all from what I've heard. Guess if a car didn't have much grip they'd allow it more grunt with the aim of the same laptimes but not 100% sure on the process.
Downside of the Aston is fuel consumption, it properly guzzles it!

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