SLP now offers a new LT-1 adjustable fuel pressure regulator kit. This kit converts your non-adjustable factory LT-1 pressure regulator to a fully adjustable fuel pressure regulator that will enable you to fine tune your engine's power output for maximum vehicle performance. Increases up to half a second in 0-60 MPH and 1/4 mile times can be seen depending on the application. Each kit contains a precision machined aluminum cover, all necessary hardware and complete installation instructions.

I copied the above statement off the website. My understanding is if you need more than the 43.5 fuel pressure the stock fuel pressure regulator offers, this item allows that. Of course that requires a bigger fuel pump to boost the pressure up that high. For use on high horse power applications only where the stock unit will not do the job. Here a site and info that talks more about it. opened one of the pouchs to check the instructions, otherwise its all factory sealed and everything looks brand new.

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