Thread: Cold start pop
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      10-24-2011, 02:38 PM   #7
Twinbo
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This is opinion not science:

Cats usually remove hydrocarbons and other non-combusted material. When the engine is cold most cars run a warm-up program (rich fuel mixture). I'm guessing you have unburnt fuel entering the hot exhaust and that's where you get the pop (or flames in some case).
This is only a guess but would love to hear someone with knowledge confirm or deny.