You can make one adjustable yourself... Just drill out the regulator portion, punch out the pin, slot it and reinstall it.
If you are stock, I don't think you are going to need it though.
All you need it is (assuming you have the regulator off) a 21/64" drill bit, a dremel or a cut off wheel and some patience.
With the regulator off flip it over and note the hold in the center with a bronze inside, Make note of where the tab is on the side and mark it, you will need to put it back to get the prior pressure (if it is near the top, you have potential for adjustment, otherwise you are out of spring)
Punch the center of the hole and drill into the bronze (not a lot though, you are only trying to get the bronze out...)
With it drilled using the punch, drive out the lower portion.
Take the screw out of the washer and using the dremel or cut off slot the center for a flat screwdriver:
Reassemble the regulator back together and you are done. The ONLY downfall to this is if you want to increase the pressure, you have to take the injector lid off. But once you get it set, you won't be changing it.
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