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Cross drilled rotors won't take the same abuse as slotted on a track. But unless your a pro racer don't listen to the overhype against cross drilled....
You can add your own after market white letter stickers. There's a shop online that makes them. They look great.
Well, the OP is asking how miles before he should mod. And the most common answer is around 1000 miles or after first oil change.
If you're looking for some OEM Boss axle-backs, I have a pair FS.