The advice an old buyer's guide to Corvettes gave was this: if the seller's Corvette has been modified, treat it like a damaged car. Figure out what it would cost to return it to stock condition, then subtract that from what the car is actually worth for your buy offer.
You used to see lots of modified '70s Stingrays in performance and hot-rodding magazines of the time. Those modified cars are nowhere to be seen today. That should tell you something.
By the way, a lot of aftermarket wheels are garbage. In the US factory wheels have to meet specs and regulations. Aftermarket wheels generally don't have to, though many do. Tire pressure warning systems might not work properly with custom wheels, for example.
You used to see lots of modified '70s Stingrays in performance and hot-rodding magazines of the time. Those modified cars are nowhere to be seen today. That should tell you something.
By the way, a lot of aftermarket wheels are garbage. In the US factory wheels have to meet specs and regulations. Aftermarket wheels generally don't have to, though many do. Tire pressure warning systems might not work properly with custom wheels, for example.