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It has mostly nothing to do with the fpr. That fpr problem strangely enough happens only to zilvia members, everywhere else in the world, oem FPRs are fine on the SR20s.
Anyway i'd strongly suggest to bring it back to the tuner and have a little chat with him.
Because either you are extremely unlucky, and your fuel pump gave up after he was done mapping, or he "mapped" without using an AFR gauge and sensor.
Depending on the boost you are using, gapping the plugs a little smaller could help.
But clearly, if you can rev fully except on WOT, that is your fuel pump dying (and your engine running ultra lean)
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