Exhaust Pros/Cons for Slant 6

I built my own exhaust (up to the muffler so far, still have to do muffler and tail)
One of the super 6 stacks I bought about 3-4 years ago had about a foot long, sawed off stub of 2-1/4, with a good flange already still there.
I hate to admit it but I went and raided a dumpster at an exhaust shop for the bends. I found a whole exhaust off of I don't know what that actually looked brand new, don't know why it was taken off..... "Upgrade" maybe? Bends looked mandrel bent, definitely not exhaust shop crimped and bent. And it was the same 2-1/4 as my stub on the super 6 manifold as well as OEM stainless.
But I put the truck on a lift, drug out my MiG and chop saw, eyeballed what I drug out of the dumpster, cut it up, tacked it all in place when I liked what I saw, took it down and welded it all solid ... Muffler is what came with the truck (it's been replaced some time since 1985) for the moment.... Originally I just did this so I could drive it to the exhaust shop and have them make me a new setup from manifold to tail but I'm rethinking that and may just put a new muffler and tail on what I built and run that for all I can. Thinking big oval almost round (what used to be called) RV muffler and see if I can still get just a stock replacement tailpipe for the truck. Mine is no racer but this exhaust configuration will definitely breathe better than the original one would have.....