I don't have numbers on that. My gut says that, unless you have the Dawg mod, and have done port and polish of the entire intake, ported the exhaust logs, and removed the restriction in the Yzpipe, little to no benefit.
That having been stated, I have this mod, supposedly. I have the other mods, also. When the engine work was done, I provided such a throttle body, which was supposed to have been put on. Of course, the adjustsble FPR, high-volume FP, and other items were also provided, and not only not used, but vanished. My Fiero goes.