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Yerr as essex_lad has said the PBV will increase fuel pressure thus pumping more fuel in so you will have to get the chip remapping for the full advantage on the PBV.
heard they dont do much, coz the idea of the chip is to sort out the fuelin making sure the right ratio air/fuel is bein pumped in so the PBV will jus do the same as the chip but wont be as accurate!