You will want bigger injectors, a bigger fuel pump, a fuel pressure regulator

- and some form of ECU control

(piggy back or standalone).

In truth if you get a piggy back

/ standalone you will be able to increase the injector duty cycle to give more fuel

(as I seriously doubt the stock injectors or pump on your car are anywhere near maxed out)

That super chips thing you have is only good for ignition adjustment.

Only 171bhp for all that tuning work?

I would expect more, dosnt the GE make almost that power from standard?