Heya buddy, I dont have an X-Brace I have a Cusco Lower-Arm Bar, which is probably about 66% as effective as an x-brace for about half the price
I'll have pics of the brace soon which iw ill post in the gallery some day, so stay tuned.
It goes right where a normal X-Brace goes as well...right under the Oil Pan, Oil changes may be messy!

I have used the AEM without a by-pass with full efficiency. No hydrolocking issues even the harshest rainy winters of new zealand.

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You're not alone. I'm running stock rotors, calipers and lines with DOT5 fluid and semi track pads and don't have a problem with the set up either on the road or on the track.

I was at the track yesterday for my maiden supercharged run and the only component that was limiting performance was the nut that holds the wheel.

 

Besides the CAI, the best investment one can make is to participate in a performance driving school. Knowing how to handle the S2000 at its limit is priceless

 

Best Mod is to supercharge your s2k. Please don't ask which SC. I do not want to turn this into a Comptech vs. Vortech thread even though the Comptech is better .

 

Everyone has different opinions, but you need to ask youself "how long do I plan to keep this" and "how much time and money do I want to devote to this" and "looks or performance"
(1) I think a hardtop is great investement if this is you daily driver. (HARDTOPGUY will beat anyones prices for these and deliver/install)
(2) CAI is a must. Its relatively inexpensive and helps with day-to-day driving i.e. traffic. now which one to buy is whole other debate
(3) exhaust- my preferance is single outlet
(4)X-brace (if you plan to go on agressive drives)

-there are more and I'll post my complete list later