With S2000s' a single exhaust has proven to make more power over a dual, but, they look a little "Unbalanced" as you have a giant hole on one side.
Here's an LHT solution.
We built and Dual exhaust that primarly uses one muffler, the muffler on the right runs 95% of the air flow under full throttle. The muffler on the right is branched off from the main pipe, It has small expansion holes in the main pipe so flow and sound will flow out untill wide open throttle.
It looks very stealth and sounds great.

Here's some pics, Dyno comming soon.....





Also we like mufflers to be straight, most dual S2000 exhausts angle outward.

Used the stock S2000 tips which were powder coated black.




Very Stealth !

Here's some sound clips.

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MOV02908.flv video by lhtperformance - Photobucket


MOV02910.flv video by lhtperformance - Photobucket

Dyno results comming soon.