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From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
There are a couple of other threads discussing pricing but the big cost will be the difference between the discount a dealer will give you to get rid of a 2007 and the less interest they will have in getting rid of a 2008. I can imagine it costing $10K to get that exhaust even if the option price is only a few hundred.
This is my biggest complaint about the 2008 my - GM releases all the specs for a new, improved C6 but fails to tell anyone what the he*l it will cost. My guess on the exhaust, it will be around $1000 - $1500, comparable to aftermarket setups.