Well I wont claim to know a graet deal about all the dynamics that are involved with mods like this but I will just tell you guys what I have done.
First. I left the inside cap off of the airbox. The one that uses 3 Phillips scews to hold in place.
Second. the plastic tubular shaped piece that inserts one third into the air filter itself. I have cut a U-shape out of the surface that faces the front of the bike. This In my opinion lets air reach the inlet ports easier.
Third (this is the bold one).. The surface that the air filter nets up against when you push it on. I carefully laid out the centre of this and using a 1 3/8 hole saw drilled thru. On the other side I simply glued an 1 1/2 ABS 22 degree elbow pointing down and a little towards the rear of the bike. RAM air, but not really at the same time.
I also installed a new Throttle Position Sensor and the same time. (mine was acting up at low RPMs.
Now for the results.
More deep sound when under full power (love that)
Seems to Rev up quicker.
I am spinning the rear more for sure
The front end creeps up with quick Second Gear changes (never has before with 30000 KM on the clock)
I think that the mod was a complete success. I think that the bike runs better than it has ever run before to. (bold statement I know)
As far as any damaging effects, I know of none.
I suppose pics will be requested at some time..but I think you can follow the idea easily.
If there I one regret it is doing all these at one time. Now it is hard to really say that any one thing has made the most improvment. Thats the risk in modifying too much at one time..