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It sounds like there is something up with your car. I'd check for any kind of boost leaks and to make sure your wastegate is hooked up and functioning properly. From what I've seen, you should be getting full boost well before 4000rpm. I've seen guys with K27 HF's and other modded K27's making full boost somewhere around the ~3k rpm range so you don't necessarily have to convert to a GT series if you're just looking for better response. If you could give us a bit more info on your setup (all stock, mods, etc?) we might be able to help out a bit more.
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