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Miles, that is basically the same muffler I have on my truck, except from Thrush, and so much cheaper. Flowmaster lost their patent, and Thrush took advantage and copied the design.
It's actually a used FocusSport cat back system, but it's stainless and from a guy in Texas. So other than a few scratches it's mint and I saved over a hundred. I also got a set of Eibach Sportline springs from the same guy, those will go on next but I have to get new shocks before I do that.
Truck is out of the shop and moving under its own power.
It has an air leak of some sort not sure if it's charged air or exhaust. Starts hissing like a shop air hose leak about a quarter second after startup and stops as soon as the truck is shut off.
Checked the degas bottle cap nervously on first hearing it and there's no excess pressure there.