Originally Posted by minimike1

toddtce is correct- that is perfectly normal and nothing to be worried about. I'm more concerned about the fact that you paid money for vented rotors that aren't venting anything. Did anyone notice that the vent does not extend to the end of the rotor? Where is the gas supposed to go? I would call up your manufacturer and ask what the deal is?
Unless your doing some serious racing, a BBK is a waste of money (check out mc2 March edition). And if you are going to race, most of the race series out there (SCCA & NASA) require stock OEM rotors anyway. The only series that would allow for a BBK would be the Koni Mini Challenge. I believe that it only runs in teh UK and Australia. Testing has shown that OEM rotors perform at the same levels as non-OEM's in stopping distance. All you need is a good brake pad. (check out www.autoxcooper.com-those guys have it together.)

Originally Posted by rustyboy155

Todd can likely explain it better than I can, but it's not something that a stiffening kit will solve. Unfortunately if you're going to be tracking your car on a track with intensive braking points, you need a BBK, or at the very least you need to expect to change your rotors out every 8-10k miles.