I am stage 2+ revo on standard airbox with vwr filter. My tuner allowed me to try a induction before buying, he ran the same revo settings with both and said it would only be right at the top end it would make any diff.
I drove with both.....
Revo intake, not as much low down torque and a more 'woolly' feel to the throttle response. Basically not as crisp low down. But a bit stronger up the top end of the Rev range
Standard airbox, much crisper and stronger everywhere except right at the top end, when I really rang the car out towards the redline if pulled slightly stronger right at the top. But in normal driving, overtaking etc in the midrange the standard airbox was better. I am sure track day lovers would appreciate the top end of the intake. But for road driving it's a no brainer for me.