You know, your graph looks just like the the Hi-Comp EG's graph BEFORE they put the open headers on with the TWM's. It was doing the same thing. Made heaps of power in the midrange but up top it just fell flat. When the put the much larger open pipes on it made a HUGE difference and the top end power just kept going.
So, you might find the ITB's are flowing much more than what the heeaders can. Try a much larger pipe and see what happens. You might be surprised.
Just for reference those bigger headers made 13kwatw diffeence up top and for longer with a 15kw difference in the midrange even though it was already very fat.
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