you mean a power boost valve yeah, if so, save ya money!

the fuel pressure regulator as standard is adjustable anyway and shouldnt need adjusting, but if you look at the standard regulator, your see a small round bit on the top thats blank, about 5p size, if its still there, drill it with a small drill, dont give it any shit as its a bit of alloy about 2mm thick, but drill it in the middle with a small drill but be carfull when the drill breaks through, screw in a self tapper and pull the cap off, under it your find the adjustment screw but dont do it yourself as you could make it run lean, but if your going for a tune up they will prb adjust the regulator if it needs it anyway