I did for about two months, then one of the LS3 cans developed a bad rattle. Possibly a heat shield pealing back inside the muffler. Strictly coincidental, it could've happened to the original owner eventually. This only accelerated my purchase of the MRT V2.0 axle backs which I absolutely love and endorsed in many threads here.
I know that they stopped adding those dash plugs on the 2LT/2SS models, because they have no desire to ever go this route. I believe TAG ( who is very knowledgeable with this mod ), and a few others have already given the right answer for which wires you could use. I personally have not checked, 'cause my car was one of the first to built.