You've got a ba, so valve springs will be an issue, might need an actuator/waste gate mod to maintain boost and so it doesn't spike also if your fitting a decent exhaust.. The auto won't last too long with around 300 at the wheels, which you'd prob need to beat an standard FG F6.. It can be done cheap, second hand injectors, gutted cat, monza cooler, but if your valve springs are week and boost can't be controlled well, and then u got to worry bout your auto, then it will add up and not worth it when your gonna get an F6 later on anyway.. How long till you get the F6? I say save for your 'dream' F6, get a tune on the ba, maybe some injectors and be happy with that..