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Waste of time unless you need to adjust the baseline fuel pressure (erm, not certain of the terminology - wheres BenR when you need him?!). Had one on my old Valver, but that was due to uprated cams.
on most of the new renaults you cant fit a boost valve due to the standard valve is part of your tank sender unit.the injection rail only has a feed and not a return so no where to tap in the boost valve.on some of the models you could fit an earlier vehicles fuel rail,pipes and sender unit to give you a feed and a return so you could fit a valve(only possible on f/k and 1.2 8v d engines due to the earlier versions of these engines had a feed and a return.not possible on 1.2 16v d engines due theyve always had a feed only)