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you will run out of injector with those racetronics injectors if you go FI, but if you go big NA theres a strong possibility you'll run into tuning issues from what I hear with the stock pcm. Personally I've never done anything larger then the racetronics 42lbers but I hear all kinda issues once you go much larger. Also consider the racetronics injectors you speak of are rated at 43.5psi...whereas LS1's have a stock FP of 58psi meaning those 42lbers are actually more like 50lb injectors.
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