procuring the 4AGE ITB's is the cheap / easy bit...
I gave Luke a set for his coupe - cruel gift!
There are far more affordable ways to get performance out of an A series, I did the ITB's for personal preference as a point of difference, aesthetically pleasing, tunability with sweet sounding high rev A series music
These are the things u need to acquire to make work & ball park costs from my experience:
> High pressure EFI feed pump (& preferably a surge tank setup with lift pump) $200-1000
> Uprated feed line & new return line from engine bay back to tank (or surge tank) $50-200
> Fuel Pressure Regulator, New flexible fuel lines, filters & fittings $200-500
> Custom inlet Manifold $400-1000
> Custom Fuel rail & injectors $200-400
> Fuel control ECU, wiring loom, engine tacho signal, relays etc etc $1000-3000
> Velocity stacks / trumpets $200-400
> Dyno tuning $300-500
I also obviously have gone to ECU driven wasted spark ignition setup & have oxygen sensor etc
If I was to do it all again I would do it differently.
I would do EFI Hardware ITB kit or similiar on a redline DCOE manifold with haltech or Link G4 Atom
I would be surprised if you could ITB / EFI an A series for under 3K; my setup owes me close to 6K