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I am running on 2.25 straight pipe and custom header with no cat
header is 4-2-1 and spoon exhaust i have unorthodox pulley kit and
aem v2, i also have the hks air fuel regulator.. and i was wondering if i change bigger injectors? will i get some more performance gain? if so which kind should i look at? thanks

 
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the only reason you would need bigger injectors is if you are turboing it. the stock injectors can shoot enough gas for what you have. Even with turboing, the stock injectors can handle 4 psi of boost. so just get a safc-II or vafc and adjust the mix so its stoich