it's also because over a few years the cars tend to get dangerously fast. imagine dropping all ruled restrictions now for seasons (brakes, tyres, aero, engine durability) etc. they would go test and the drivers would kill themselves.
also, after a few years of stability, the innovations get into a slump and it's time to throw in a new challenge for science's sake
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435i Coupe
Estoril Blue on Black
X Drive, M Sport Package Stage II, Premium Package
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