Yes, take out EVERYTHING of a the case. When you cut metal, small pieces of metal go EVERYWHERE and get on everything. If even one flake makes contact between two metal electrical points, or RAM, CPU....ZAPPP!!! bye bye component. Adding the blowhole keeps the temp on top within 2c of the bottom temp almost all the time, I can feel the heat during heavy gaming sessions being blow out, heat that would otherwise just be building up.