is a date w/Pam Anderson worth $10,000 ? Maybe to some, that's pretty subjective. It all depends on if it's worth it to you. You won't gain any performance, so it all comes down to looks and sound. Someone over at S197 forums has a set for sale, pretty cheap.
I read an article long time ago that side exhaust eats up about 15 HP because of the way it has to be routed on the S197. IMHO you pick up about 30 CP (Cool Points)