I’m very sceptical about induction kits if you ever look at them they sit in the engine bay with their own "cold air feed" (pipe from front of car usually) but this means that the cone is only going 2 suck in a proportion of cool air, the rest is going to come from under the bonnet e.g. hot, non-dense air which will actually hinder power. Plus your car sounds like a Max Power Nova. An interesting article in Autocar a while ago was about the Renault Clio Williams. One of the mechanics who serviced the cars said he had seen up to 10bhp power drop from fitting one of these induction kits!! Admittedly there is less room under a Clio’s bonnet so I would imagine a higher under-bonnet temp than an Alfa but the same rule applies. Most people are probably fooled by the extra induction noise and therefore think they have got more power... sorry yet to be convinced.