i also recommending upgrading valvetrain if youre gonna make that amount of power, ull need to think about the valves, the retainers, the springs, also think about fuel management because running lean...is just not cool, ull probably need new injectors, fuel pump....hhaha u know wut i just realized i said almost the same exact thing as suprra girl...oh well...its the right thing to do, as for the ecu... i think its harder to make that amount of power off a piggyback..though possible its not easy...a standalone is a lot more efficient, but yea it will cost some hard earned cash but i think its the best way to go because there are more choices and applications if you go standalone, piggy back is also good but when make serious power such as 600-700hp...i would recommend getting a standalone
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