Mine was still on 4-injector KE at over 250bhp!!

It varies SO much from car-to-car. The metering heads are, by now, so old and their performance is the governing factor as to how much power the car will produce on it without assistance.

With that said, the car can be mapped for more power and better off-boost economy with an additional mappable injector, so that is the nicer solution. Normally, on KE, there isn't a really nice way of increasing on-boost fuelling without ruining off-boost economy.

How about this.....??