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Folks have played with a fifth (manifold) injector - esp. for higher tunes and/or E85 gas flow. Threads are on the forum if you want to search. I also seem to recall one vendor had a kit(?)
 

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Why? You can buy a HPFP and bigger injectors that will run an e85 tune, so why would you need 4 more injectors unless you're drag racing and pushing every gasket, nut and bolt in the motor. Maybe in a professional drag racing application I could see it, but for normal street use, it's not necessary.
 

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