drilled my airbox today i used a couple of different sized hole saws from 2 1/8" to 1 1/2"
managed to get
2, 2 1/8"
2, 1 3/4"
and 2, 1 1/2" holes
leaving hardly anything left under the filter and
its awesome :D i cant believe the difference its made, normal driving there is no difference but...