If you guys want the sound of an induction kit just take the lid of the airbox off. Is way cheaper than any induction kit and you would get the same performace gains as with other induction kits, none.
If someone proves me that there's an induction kit that actually makes power I would buy it, no matter what it cost (if it is in a reasolable price range, not like the Clio R3 airbox that costs several hundred pounds), but as no one shows that I'll stay with my standard airbox.