I don't think it's about power E-Nough, it's tuned to 430, but I got it under 4 for daily. KooKoo's right, I don't care about the 5, 6, 7k. I hardly see it in city traffic. I think it would be more fun with a smaller turbo and faster spool.
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doc_tai, can you elaborate?
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kevgk, at what rpm are you reaching full boost?
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By the way KooKoo, 400 and 7.5 psi is exactly how my tuner set mine up as well. Seems to be the magic number.