I'm having a hesitation issue with my FD it revs perfectly fine till 6000rpm where the rev just seem to stop. I've searched boards all around and the posters with the same issue just seem to abandon thread. I've replaced my fuel filter so the clogged filter is out of the question. If its on WOT going up I can see my boost guage stays the same, leaks and turbo could be cut out as a culprit to it too. All 4 injectors are good primary are new

My fd is a zenki 94 ( rhd )
hks intakes
mazdaspeed exhaust
fuel pulsation damper has been removed
tomei fpr

I can ease it to redline though which is peculiar which makes me think that it could be a fuel cut issue? or bad sparks ? cause I have yet to change that

* I'll actually update this once I figure this out