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I have a Brand New (in Original Box) GM TBI Injector Pod w/VAFPR for sale. I even have the 'upgraded' spring from TDS that I will throw in for free!
GM Injector Pod w/ Vacuum Adjustable Fuel Pressure Regulator
Part #: 17113186
I paid $82.37.
(NOTE: This part is no longer available. When I typed in the part # at gmpartsdirect, it said that it had been discontinued. If you perform a search for the part # using Google, you will find several listings quoting the price to prove my claim.)
I found the following write up about: GM TBI regulator P/N 17113186 is a direct bolt-on jobbie, and will give you about 18-20psig fuel pressure. Additionally, this regulator has vacuum compensation capability. If you hook the included vac port to manifold vacuum, then you'll get a part throttle fuel pressure decay of roughly 1psig per every 2"Hg manifold vacuum.