jasonsong007,
my car is stock in performance wise as of now
and we raced just off the line but not too fast.... we were even and I pulled about almost a car length, but then the S4 took over and out powered me and pulled and kept on pulling..... I would guess with just basic mods of up/dp/exhaust it would be closer.
but again, im not sure.... but S4 will easily beat stock WRX....beaten at top speed is definitely a given.

 

Here is a shot I just took tonight..
not the best, but just playing around with some angles...

 

This pic is for MAKU
here is a pic of wheels and center cap.
Let me know if you need anything else.

 

How is the ride with the S-Tech springs? How do they perform when doing high speed turning, and what is the ride quality like? Does the car have a very bumpy ride at all?

 

Ride with the S-techs are fine. of course a bit more rough than stock and since I have the 45 series tires that doesn help. with the stock tires, i think the ride would just be as comfy.

High speed turning...... hhhmmmm i think the tires have more to do than just the springs. but bodyroll feels like it is almost illiminated. from inside I can feel it, and from my friends as well stated, they see MINIMAL bodyroll. from stock springs, it is NIGHT and DAY~!

Not so bumpy at all... Ive driven crazy bumpy roads and it does get bumpy, but thats what comes with stiffer springs.

I don't autocross,drag race or drift that much at all so that is why I got the springs. If I was a usual at the dragstrip or autocross event, etc, then I would have NEVER gotten springs and saved up for decent coilovers.
If I had enough money to waste, of course, I woudl get coilovers. My $.02