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Hello So its sorta hard to explain, but ill try my best. I have a 1998 R34 GTT Skyline, It has a rb25det NEO. It has no engine mods other then an oiled HKS Pod filter, Apexi Front mount intercooler and an Apexi AVC-R Boot contoller. I have a problem (is most noticable in 3rd gear) where when i hit apoximatley 5000rpm power drops and from outside the car it sounds like im on red line apprently. I am still obtaining the same out of boost and injection percentage according to the Apexi AVC-R. When i set the boost at stock pressure the problem goes away. However the problem accours again when i turn the boost up. Starting at 9 psi and onward up to 11 psi! (i havent tried to go any higher) iver also tried it with traction control on and off and it makes no difference. Please help, Do i need a tune or new plugs and coils, etc... Thanks for your help, Im new to all this. Alex