A 20V GZE is a great idea, but you're gonna need a custom intake as the stock one will blow its seals. The SC14 is gonna be hard to squeeze under the quads too, as there won't be as much room in a FWD setup. You won't find a standard ecu that will get a decent tune, an adaptronic ecu will let you do your vaccum trigger on the S/C. Download the ECU interigator off if you want to see the features- adaptronic, you'll be amazed at what it can do. 8 Aux in and 8 aux out and a 30x30 tuning map :kiwi:
I don't know anyone with a 4AGZE that converted to turbo that wasn't over the moon with the performance gains. Eating clutch's for dinner is the easiest way to get some bite off the line with such a setup.
Before you think about such an expensive project you need to ask yourself, am I in fantasy land where I wish I could make my 4A pull like a V8 off the line? I know I am, but I know it's a pipe dream, that's why I'm gonna play with an atmo 20V for a while.
Have you ever been in an overpowered FWD car ... coffin ? Throttle based lane changing aint cool.