With proper tuning and solid supply of air to the cylinder you should be just fine, is there a billet wheel you can get for the Gt4094R? I cant remember. I would probably get it if there's one available. Also, a modded cp3 will most likely be needed. An intercooler isn't needed, but wouldn't hurt at that point either, anything you can do to keep the charge air cool and dense and keep cylinder temps down is good. In the end, how you drive it, and how you take care of it will make a bigger difference than the size of the injectors, IF ITS TUNED RIGHT. Economy loss isn't guaranteed from what I've read, but it's the Internet, so.... I would think less economy would be expected, just because the power is there to have, but if you were so inclined, I do believe you could actually get better economy if you really REALLY tried.
What are you trying to accomplish anyways? 40% overs can run 750 whp and "typically" wont haze or cause economy loss like 100's can, just sayin. I don't even want to open this can of worms, but the time is coming for me figure it out too, I am trying to put it off as long as possible:angel: