Actually, most cars will self-trim the injector duty cycle if they start getting rich, that's what oxygen sensors are for. If you need the extra fuel, and the injectors can't keep up the flow, then a adj reg would work. That's a ridiculous waste of money for 5 or 6 WHP if you don't have enough mods to need the fuel control it gives you. I don't see the point. i'm sure that an FPR will help when you get out of the range of what the injectors can flow on their own..

If you don't need the extra fuel anyway, why does a FPR matter????