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Over at EvoM they seem to have good reviews so far as I can tell. In one post a guy had AMS tune his car with Crower 272's and had mentioned to the owner that they made a little less power than they think the HKS would have but were good none-the-less. If you are interested in every HP for your penny these might not be your first pick but from what I can gather they seem to be doing just fine.
Edit: Forgot to add that GSC and Cosworth are about the most popular right now and seem to be producing similar power outputs with similar mods. If Justin wants to chime in I'm sure he's seen plenty of logs with both sets of cams to tell you what he thinks.
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