I agree with tobasco, in the sense that cutting holes is not the best idea. Even though it may improve the sound quality, you want to maintain the origionality of the car, in case a future owner decides to revert it back to it's previous state. That's why I've only done "bolt on" mods like K&N drop in, lights, and shocks: it is relativley easy to take off if need be, and it doesn't change any stock parts. On the other hand, throwing in a loud and clean stereo system is not a bad thing, as long as it can be taken out cleanly.