Why should they? Especially when the rules allow you to run old cars with updates and be competitive. As a manufacturer why would you waste the money for a brand new road car to serve as your base for a race car? It makes no sense unless the car is so old that its time has come or there are brand new rules. Aston are finally going to make a new Vantage (or car to replace it) in a couple years. Until then, the current cars like the Vantage and 911 do just fine inside the rules.
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