This boy needs some e85. I'd say also that you would be better with smaller piping and possibly that ATP just sucks. What fuel are you running? There is a few threads with EFR turbos pushing more power and quicker than your setup by a lot. One is kellys he's destroked with reverse manifold efr7670 and his hits powerband ~4K and rides that baby to redline 8k.
What are you using for boost control? Potential the wastegate is blowing open? I cannot understand how short your powerband is.
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