Cam specs for performance cams for a turbo engine (b6t) are going to be different from specs on performance cams for a naturally aspirated engine (b6). Crower can regrind your stock b6t cams, not sure if this will give you better performance than the HKS cams. You need to do some research or find someone very knowledgable on the actual specs of stock vs regrinds vs HKS cams to see which would be better.
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