An FSE valve won't cause any problems... it's just that they don't really add any performance gain to a relatively std engine.
On the box they promote better throttle response, etc... I cant see that being measurable.
Under hard acceleration, the small rise in fuel pressure will be a help!
Soooooo, it may be better value for money to buy a fixed pressure regulator, set at a higher pressure.
I bought an FSE as I wasn't sure what fuel pressure I was intending to run, and I also changed the number of fuel injectors I was using. After setting things up though, i'm actually running std fuel pressure anyway...
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