hmm.. I'll think bout it.. Got any bad effect after install, like injector not long last?
an injector is one of the most robust device in modern cars. If the pressure is set too high, the fuel mix will be too rich, which kills the spark plugs first. The fuel pump, the hose coupling etc will go first long before the injectors.
We only recommend to increase the pressure by 0.3 - 0.5 bars for stock fueling system and stock internal.
william, I am sure that you have seen MANY car, not only BLM, runing on adjustable FPR without any piggyback.
This is never for FC improvement. Performance gain is largely depending on what other internal modification that you have done priory, that has changed the fueling demand.
Put it in simple words - an FPR is a complimentary gadget for other mods, but itself doesn't need anything as a prerequisite. From complete stock, expect to gain not more than 4% (and that's considered a lot).