My fuel pressure regulator needs replacing, however the original part from the manufacturer is outrageously expensive. While looking for less financially painful alternatives I've seen much cheaper universal units or similar units made for other cars (shape and fuel pipe diameters are the same), however the maintained pressure is a little different. The stock one is rated for an odd 3.09 bar, while the closest ones available are usually 3 bar or 3.5 bar. Is it absolutely critical to get exactly 3.09 bar, or the car will be fine with 3 bar? Maybe it is preferred to go for more, if not exactly 3.09? Doesn't the stock unit have some kind of an error anyways (+- 0.1 bar, for example).
The car is a 1999 Volvo V40 1.9 Turbo.