http://www.arms-eng.com/ has some interesting exhausts and chasis rigidity parts. Never heard of the company in regular NSX circles and just saw their ad in VTEC Sports #20, page 90.

There's an exhaust shown in the ad, named the Special GR Muffler, that has more tubes than even the most unaesthetic GT One. So much so that the floor of the trunk has to be removed for the twin mufflers.

Of particular interest is the "Rigettofram:"

Surprised SoS doesn't make something like this yet ^.

And the ABS Killer kit:

Or this ^. But I'd bet they're in the works.

ak, translate por favor!