Fit
The track that we have been running at is super slick normally and almost all the turns are off camber, so the kit tires aren't much of a disadvantage. They actually work pretty well on that surface.
Evil_S10
If you're going to go and buy a set of shocks for the car, I'd get the Yokomo short shock set. It already has short shafts which are good for the 03. Otherwise, I'd just rebuild the ones you have. The Associated shocks are very smooth when they don't leak. If you set the droop on the car by using spacers and o-rings on the shock shafts before assembling the shocks, you shouldn't need the swaybars. I don't find that my 03FS needs them and I don't run them on my 03DJE either even though it came with them.