[Theo@BluePower]

It would depend on the exhaust thats fitted to the car.. systems like pacemaker and x-force have very small gains but if you put on a Di Filippo System the gains will be bigger..

The smallest gain i have seen from our CAI is 5kw and the most i have seen is 35kw and thats just bolting on the CAI.. Most cars we see a gain of 10-20 from it..
When you add a exhaust to the figures it can change things.. some cars are restricted by the exhaust and get largers gains from them and other cars the intake is the restriction.
From CAI and a Good Exhaust system you would get 15Kw worse case and 40Kw best so somewhere in the middle is a average of 20-30kw gain..

Just did a FG S/P 315 manual today.. stock it ran 211kw bolted Di Filippo Big Boy system with 1 7/8 headers and Our CAI the car made 250.4Kw without tuning.. so thats a 40kw.
First tune put into it and its at 260kw.. once tuned this car shouls have got about 55-60kw gain from CAI, Exhaust and Tune

Hope this has helped