Switching to an Adjustable FPR can give you up to 10hp according to all the articles and stuff I've seen. It lets you set the fuel pressure to an optimum rate when mixed with the air coming into the chamber. Adj. FPR are good to have even if your car is mostly stock, and a good AFPR like the Kirban is about $75 U.S. Bigger fuel pumps are needed with modifications, the more HP your motor has the more fuel it needs, the regulator then lets you set the pressure to the most efficient Air/Fuel ratio.
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