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24 When ordering fuel injectors for your EFI conversion, you have to take into account the engine’s horsepower level and whether you’ll be using a power adder or not (supercharger or turbo for example). The X302’s 340hp level dictates 24-lb/hr injectors, which we sourced from Ford Racing (M-9593-AA302, $189). You can find some great info in the Ford Racing catalog on calculating injector size. A set of Professional Products billet fuel rails with fuel pressure regulator (PFS-10601, $230.95) tops the injectors and is a veritable bargain from Summit Racing when we found out stock Ford fuel rails are nearly $400!