Intake made a significant difference but the ECU slowly compensated the power gains away with LTFT. No doubt a remap would bring that back. However the fuel trims doing their thing didn't alter the throttle response. The panel filter had a tendency to bog when at low rpm, this completely disappeared with the intake.
Exhaust added a bit of punch throughout the whole range. Not huge but it does rev a bit freer.
/edit - reworded what I wrote because it wasn't particularly clear. Also added engine pic.