Here's a quick write-up of my electric exhaust cutout installation. I did the installation at my parents house in Georgetown with my dad. When I say "I did" I probably really mean "we did" it - or better yet, he did it. I got the cutouts from Dave Hacker at DMH Performance .
Here's a picture of where I installed the button. It's the round button right above the T/C button (which is right above the center console compartment). It looks factory, so it's kinda hard to see unless you know what you are looking for.
I ran the wires through the rubber shift boot, looking up from under the car - it's the white rubber part on top of the transmission. I did the whole installation without taking the cover for the shifter off, but I bet it would have been a hell of a lot easier if I took it off. I just put my hand up the side of the console to feed the wires and make the hole in the shift boot. I put my hand in the side of the console where you can see the wire hanging out in some of the pictures. I centered the switch above the T/C button and had to cut out part of the plastic so it would fit through. I took the top level plastic off, drilled a pilot hole, then used a 3/4" bit to make the hole for the switch.
The default length of wire that comes is extra long, so I just coiled it up under the center console. I had to extend the red power wire because I installed the switch right above the traction control (T/C) button and I wanted to pull power directly from the fuse box. I fed the power wire under the center console and up into the fuse box to a 20 amp fuse.
For the time being, I wired the black ground wire onto the bolt on the passenger seat closest to the console. There may be a good place to ground it under the console, but like I said I didn't take the console all the way apart.
There are many more pictures in the photo gallery eCutout album