UPDATE......
Well, the magnaflow muffler arrived. I was going to install it myself, but there were issues. The magnaflow is a center outlet on one end and an offset on the other. The factory muffler is an offset on one end and an opposite offset on the other end. Also, it was a few inches shorter and I could not find and 3 1/2 inch pipe.
So, I went to the local muffler shop. I knew I was in trouble when the guy said "come into the shop and see the issues". Due to the non-comparable offsets, he first suggested taking a piece of pipe and cutting it and welding it back together to creat an angle, since he can't bend 3 1/2 inch pipe. The next suggestion was to cut the original pipe at the converter and after the muffler.....that would allow the magnaflow to be installed with a piece of straight pipe from the converter to the tailpipe....worked well.
Then he said "do you want steel aluminized pipe or stainless steel pipe." I went with the stainless pipe.
Then I got the bill.....$226.44 plus the $137 for the muffler and a two hour wait. A little more than I planned on by about $100 overall, but it looks great and it was a quality job.
The sound is another issue. It sounds really nice when I step into it, but normal driving is quiet as a church mouse. No drone at any speed except when it goes into four cylinder mode.....I left the factory resonator on the truck since I tow a fifth wheel.
My experience with magnaflow mufflers I'd that they open up a little after a few thousand miles.....can't wait!
Overall good and I'm relatively satisfied. Next post will identify any mpg increase,,,,not expecting any increase. It does shift gears at a lower rpm, and doesn't downshift on hills where it used to..,,all good