The only reason I would think you need them on a street car is looks. They look cool and if you have an aftermarket rim that shows your rotors then they would be a nice upgrade. Since I changed my rims, I'll be putting a set of drilled rotors on when the ATE power disc 's wear out.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200