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any muffler shop will do it. I like going mom and pops muffler shops for things like brakes and exhausts. Better pricing and the old guys know what they are doing.
I am not sure if I would want the "muffler guy" doing the electrical stuff but, it is pretty easy. While your car is in the air, I would see about at least getting the wires from the cutouts into the cab. Would be a lot easier than trying to do this on jacks or ramps.
You have to find a muffler shop that likes to do custom work. They are out there but it took me some digging, I went to three or four that said they weren't interested in this custom work.
This is the second time I've posted a link to my 6 year old thread today. Must be cutout day. I ran the wires myself, most shops didn't want to do it but it's really easy as I discuss in my thread.
I love my QTP cutouts, they are working great to this day, exercised them many times this past weekend with my buddy Craigster.
Had QTP cutouts installed by Florida Performance in Fort Lauderdale. Overall very pleased with the job Rob, the shop owner, did. This was his first C6 and he found a great place to put them and made the custom mandrel bent Y-pipes to maximize flow from the cutouts. We found no way to put them right after the collectors but they fit well by the trans. I have the DTE brace too but it wasn't in the way.
Installed the wiring myself along the drivers side rocker panel, behind seat then out the wheel well under the carpet. Removed the rear inner fender and drilled a small hole in the wheel well then ran the wire down to the cutouts. Hardest part is finding a hot wire when the ignition is on on these C6's. I ended up tapping the seat heater fuse as others here have done.
They are loud and DEEP when open at idle. I've actually heard louder exhaust though, I was kind of surprised they are not louder. I think it is because of the turn downs and the fact that I have cats and the pipes are pretty long before the cutouts. On the track they have a nice race car sound - I'd say like Borla Stingers plus 25%. When you open them at a stoplight you will turn heads, that's for sure.
Overall happy with the mod, it gives me quiet during my morning drive but loud when I'm at the track which is what I wanted.
Here is a video of idle with cutouts open and closed. The gain on the mike makes the closed sound much louder than it is, it's really quiet with factory mufflers even with my cam.