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I do get the little pops on decel. I also get a LOUD pop sometimes. Not usually on cold starting... that happened once, but I get it when letting off the gas and pulling in the clutch after a sustained period of speed (say, downshifting for an offramp on the highway).
I vote for... Check the header to head connection. Sounds like you have a leak that's sucking in fresh air and reigniting unburned fuel in the headers.
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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