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Remove the passenger side floor mat. Reach up and pull down the passenger side
floorboard to access the fuse block. Remove the 10A fuse located on the bottom right
side.
Thanks sampson, I found it and removed it. As far as the switch goes, I see no need for it. Even with the baffle open all the time the exhaust noise is not that loud to me. And the drone is nothing like the drone I had with Borla Stingers on my last 2 Z06s. And I didn't mind the drone from the Borlas. I got many complements from people about my exhaust note with the Stingers. Most of them total strangers.
When it comes to exhaust tone, I'm rather old school. I kinda like the noise and the burbling. In fact, if I had it to do all over again, I would not have gotten the NPP on my '08 and gone after market. IMO, the NPP/open is better than the stock exhaust but not better than after market. I'll probably switch out to Borlas some time in the future.