to get big power N/A, you must raise the CR and lighten and balance everything up.
but you will also see good mid range torque and top end over stock with the right set of cams and the right supporting mods and a good tune, it may not produce pub bhp figures but it will 100% be a much better drive, anyone whos says it wont, either does not have the experience to comment or has tried and failed to get good results N/A in the past by either bad parts, reliability or being miss informed.
It does also depend on your overall goals,
ie if you want to park up in the car park and open the bonnet and have people gush at the bling and or size of turbo or go super fast in a straight line, N/A aint for you