My friend says these things do some good stuff but what do they do were can i get one and how much

 

If you're talking about an adjustable fuel pressure regulator, there's no benefit to a near stock car. About all they do is allow you to bump up the fuel pressure to compensate for undersized injectors (higher fuel pressure through undersized fuel injectors means more fuel).

 

yep, your better off with a chip. WIth a fuel regulator you can bump fuel pressure up and down but that controls what the fuels are doing globally.. with a chip your tuner can put more or less fuel where it belongs and not apply it to the whole thing like a fuel regulator will.

On top of htat you can stand to gain from some performance spark tables.