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If you end up going after market NPP, your least expensive route is to buy used Z06 NPP mufflers, do the muffler mod or have it done, then add the switch. I'm having the whole thing done and installed for less than I can buy a used DIY '08 NPP. They are hard to find.
Upadate: Just had my exhaust installed at FasterProms in Lutz, Fl. Hats off to Laz, who did a great job and showed me his secret lab where he does his manifold porting. Jeremy Formato, the owner, was a pleasure to do business with and gave me great advice for some street performance mods and tuning that I will be doing in a few months, after my warranty runs out. Thanks again Jeremy and Laz.