I just traded in my 1999 WS6 (Caroline)............. For a 2003 Rex (Amber)
The first (and only) time I ever went to the drag strip, I was in the WS6. I only ran two times (1/4 mile) and both times I pulled low 13's. It was stock then. Later on, I added an exhaust, lid\K&N, short shifter, and 315/35/zr17s on the rear. I'm sure that if I had taken it back to the track with those mods and a little more racing experience, I'd have broken into the mid/high 12's.
Just judging from my äss-dyno, however, my friend's '03 Rex with only a MBC and a turbo back could at least hang with the WS6. They aren't very light cars at all, and it was very tricky learning to launch that thing without breaking the rear tires loose.
Just a previous WS6 owner's 2 cents.