| Dean (Spongerider) made 410RWHP on stock injectors. There are other supporting mods you need to do this though - downpipes, testpipes, cat-back exhaust. UD pulley wouldn't hurt, aluminum flywheel will help too, dual intake and aftermarket intercoolers will benefit as well. I made 413RWHP with stock turbos, single intake, 555 injectors, stock intercoolers, downpipes, testpipes, cat-back exhaust, aluminum flywheel, stock pulley.. And my engine has non-turbo heads on it too. I guess to restate, it would be viable to make ~375RWHP reliably (as long as your injection works and you have fluid) on a stage3Z that is using water injection as you can increase the boost and timing. The injectors would be somewhat borderline though.

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