I went to install my new K&N and when I started to take out the screws, I quickly learned that they're stripped. The grooves for the screwdriver to fit in are gone and not even a power drill could get the screws out. What do I do now?

 

8 mm socket.... bet you thinking whoooooooo hooooooo right now arn't you..enjoy..

 

No choice....Drill the screw heads off and open the box lid. You should then be able to pull out the remaining screw shafts with some vice grips. Hate it 4 U.
Some previous person at the Juffy lube probably cranked 'em too hard.