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bigger injectors are only needed if you need the fuel to compensate for the larger amount of air in your motor. a stock GT? no its not worth it and will be more detrimental than helpful. changing injectors isnt a performance mod.. its a supporting mod
+1 Injectors can support roughly 16hp per/lb 19lb injectors can support 304hp safely. Bigger injectors will give you problems even if your tuned for them. They don't give hp, only support it. It goes like this. If you give a crackhead a bigger pipe(injectors), they don't get stoned unless you give them a bigger rock!(s/c)..LOL