nova5409

Does anyone know the diameter of the Exhaust tubes going into and coming out of the stock Muffler? Its a 6.0 engine with 2 cats, and 2 tubes going into the muffler with 2 tubes coming out going into a y pipe into a single pipe coming out of the rear. Mine needs replaced and I wanna do aftermarket but i am having a hard time finding specs for stock exhaust tubing. This was the 1st year of the LTZ and last year of the body style so there aren't that many and gm discontinued the part. Any help is appreciated.