Stainless lines will help for sure but that not the root cause if it has changed since you got it. Fluid gets old and holds some moisture could be a cause. How long since you looked at the rear parking brakes? Have ya had it in water or mud and not cleaned the rear out? Thats tends to happen a lot.
From my experience hearing a busted cat is extremely hard from inside teh cab. Do you have any intake mods? From what you said it sounds like detonation or what is called spark knock. I have heard a broken drive plate(flywheel) make the same sounds also.
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