I can imagine in the days of 60 years ago and before that the 24 straight hours of driving at the limits would wear out the parts and breakdowns were fairly common, and parts were not really mass produced like they are now, most of the stuff they did to build the HP on those motors was home made, I believe
Racing improves the breed.
All that racing tech trickles down to what you have in your car.
Some of us buy cars closer to their racing counterparts. It's kinda fun watching the racing when you can say, "I have one of those!" (Or close enough to one of 'em.)
Hell yeah, pushing the limits helps improve the design tremendously by revealing the flaws that stress brings out where they may have not appeared without the stresses of racing, especially a 24 hour non stop race. How can taking what is learned in those conditions not lead to improvements for everybody else's vehicles going forward?
Yup. Racing improves the breed.
It used to be said that, "Win on Sunday, sell on Monday" and that was legitimately true. People would make their car buying decisions based directly on what was winning races.
That's why we still have all those 'stock' classes - even though US 'stock car' (NASCAR) is not even remotely stock. If you get into these other series, the cars start getting a lot closer to stock - sometimes actually powered down from stock, for example.
Oh, Corvette is starting a customer series. You can now buy a legit Corvette GT3.R race car and go racing with it in series like IMSA. This is the first time in their history that they've had a 'customer racing' program.
I have a 'customer racing' car (in fact I have a number of them) from BMW. My F13 M6 GT3 is a 'customer racing' car.
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