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I've always been a fan of Dinan, and if I was planning on upgrading my M model I'd use them if for no other reason than they match the BMW warranty if something goes wrong. But without taking anything away from Dinan, I'm actually super impressed by much power the car is really making stock. BMW clearly anticipated other manufacturers gunning for their numbers, and built in a big "F-U" to anyone who tries one upping them.
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