i bought a k&n filter to go on my savage.  I read where some of you are drilling holes in the air box for better air flow.  Is one place as good as another or do the holes need to be  in a certain place.  Also what size holes?

I used a 3/8 drill on the airbox door, put maybe 50-60 holes in it, I noticed a difference.  The bike also has a sporty muffler, K+N stock type filter and a 152.5 main jet. After drilling all the holes there was less noise coming from the airbox area and the bike had a little more to end. Didn't want to remove the door cause little critters might move into the airbox. Try removing the airbox  door and see how you like it before you get out the drill.

There is a product made for doing just this.  It is a "door" or "window" type of thing, that is installed in the sides of an airbox and can be open and closed as desired.