Kev doesn't need the autotune because he's got the Wideband commander.
It's basically an autotune with bells and whistles
And no, there wouldn't be any Ram Air effect with the Stage 3.
Bikes with Ram air such as old FZR's and some ZX's I believe, work by having a couple of air ducts that run from the airbox on the backside of the engine, under the fuel tank to the front cowling hidden behind mesh.
The idea is that as the bike speeds up, the air is forced through ducts on the front of the bikes causing a sort of 'turbo' effect.
We are talking here though of quite high speeds to see any real kind of pressure difference or forced induction effect on the bike and for bikes used on the road is more of a gimmick because you'll never reach the speeds (legaly) on the road to be able to use it.