I just finished reading those two. I think the first items on my list are to play with tire pressure, and to fill in some of the gaps around the wheel wells and under the bumpers. I'm guessing that'll see the largest improvement short of a boat tail or tranny swap.
I'm a little wary of over-inflating though, as I blew the sides out of one of my rear wheels a few weeks back, drifting around an on-ramp.
