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If I hadn't found a front ST40 kit (for my E46) for $1700 I'd have gone for the PFC OE upgrade kit (rotors, pins, pads, etc). Many people faster than me have said the stock calipers are not bad as long as you have brake ducts.
Anything that PFC and Bimmerworld will stand behind is certain to be a great product, but at the end your brakes are the most important system on your car out on the track and you need to feel ok with them. So buy what will help you sleep at night.
Just my 2cents.
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