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Generally the reason you put vents in the fenders is to let the high pressure air out of the wheel well. Bug and non-bug alike all have this problem where high pressure high builds in the fender wells (because of the wheel openings, tire/air interaction, brake/radiator ducting) causing drag. Louvers on top for the fenders or holes in the back relieve the air pressure and if done right can even add down force or reduce drag.
I'm going to make similar cuts in the backs of my front fenders though possibly higher up. On the rears I haven't decided if or where I'll cut but I've considered hacking 4" off the bottom of the rear fenders so they didn't catch air. One of my sources of inspiration is the 997 turbo, with the larger rear fender vents and I thought about something like that as well
I've been looking for one of those lip spoilers for the top of my car but I'm not sure who has them in stock. I'd like to put one one the race bug and decrease the angle of attack on the wing.
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