Stock with no boost mods you will not see an improvement.
Low boost does not need injectors as the pump and injectors can handle it. E85 is fine with stock injectors.
Once you get above 260hp I think is when you need fuel upgrades.
I know @
Supermassive has fuel pump and injectors that I believe he got from visconti.
Im no expert but this is what I have read on the forum. Hopefully mook and supermassive chime in.
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