If U want to keep things stock and use the OE headlights, then the relay kit when wired properly does restore higher voltage to the OE headlights. The factory wiring harness does have about a 1.0V-1.5V loss which will cause the OE headlights to be slightly dimmer. Again as I have posted previously in various threads, I drive at nite frequently and was not happy with the briteness of the factory OE headlights. For me though the Holley retrobrites are pricey, they are significantly brighter and have a wider, light output disperion than the OE headlights. Plus being the LEDs are a lower current draw, no relay kit and/or rewiring is required..Well I want to get that relay kit and keep my stock headlights . If it's better to get LED's then I might just do that .
Just my $0.02...