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it sits on the return line of the fuel rail and regulates the pressure in the rail by adjusting how much fuel is allowed to return to the tank.
Don't expect a huge increase in power from adding one. And they all essentially do the same thing, except that some aftermarket ones tend to be adjustable - you can increase the pressure to be more than standard. With the extra pressure you get a small gain in injector flow, but not much.
You'll need to set it properly when you install it. The standard BPT rail pressure is 45pounds from memory and I can't remember if thats with the vacuum hose ( to the regulator ) on or off
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