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Why would you mess about with all these thrown together sets when you can buy a properly integrated solution for the same money? You can pickup a Stoptech ST-40 front kit for $2,400, or if you are willing to spend more get a PFC Z54 kit for $3,600.
If you want to stick with the stock brake setup as others have said, get the PFC DDv3 rotor and PFC pad kit from bimmerworld. Loads of people in the track forum have run this with great results, you then have a massively upgraded setup for $1200. If I was doing occasional track work this is what I would go for.
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