So I've wanted cutouts for a while and was about to buy some DMH cutouts, but thankfully after a little research it seems DMH has fallen of the face of the planet, so I looked at my other options. I wanted quality, something that will last and have good customer service and was willing to pay more for that. So I found noweeds diverters (which are popular with the new camaros), and they actually close off the rest the exhaust and open up a 3" dump. It's possible through the dual butterfly valves inside the diverters.
Anyways here are pics of the install and a couple videos. Sorry the videos are crappy, I plan on making better ones. According to Steve (owner of Noweeds, he's awesome BTW and always responded almost instantly to any question I had) I am the 1st GTO to install these. And yeah they are insanely loud, the videos don't do them justice.
The diverters still wrapped, they feel very solid and heavy duty.
On the lift getting installed
My exhaust before the installation
Installed, removed the cats and put the diverters in place. The exhaust guy even said these are the nicest diverter / cutout he has seen.
These are the controls. (EDIT, earlier I posted the wrong way of using them).. Left button closes them, right button is to open and can be set for variable positions of how open the dump is. Even 50% open sounds insane... The middle button can be programmed for the diverter to open to a % of your choice.
I took this video right after the shop finished wiring them and one of the guys is showing me for the first time, please don't make too much of me about the commentary lol.....
And here is one more in my garage. I plan on taking better videos when I get time.