The HRC kit has a little black electronic box about the size of a 9V battery that goes next to the FPR. I'm going to assume this box contains a glorified diode that prevents the ECU from seeing boost. (It lets negative manifold pressure voltages thru but once it hits 0V, it won't let positive voltage thru, so the ECU doesn't know there's any boost.)

Someone help me out, but I think the big fuel pump and Adj. FPR take over the excess fuel needs manually from there?

Dan Green
99'RS-T