Popping sound in exhaust

I would call that 'banging' not 'popping' LOL. Not like any exhaust leak I've experienced.

After listening a couple of times, I'm on the same track as FB and others: I'd be wondering if the valves were hanging open a bit. Poor valve work or maybe too long pushrods?

Another thought is crossfiring in the ignition... like in the rotor alignment being off, or weak ignition causing cylinders to not fire at times and them dump unburned fuel into the exhaust.