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JimA=> the exhaust is under postiive pressure and will almost never draw => air INTO itself. These objections make a lot of sense to me, and the common explanation for exhaust pops has never satisfied me. I wonder what you (or anyone else here) think *does* cause this phenomenon. In fact, I wonder every time I leave my house in my Bus with the exhaust leak. I live on a steep hill, so as soon as I leave the drive I'm engine-braking in first. The exhaust assembly isn't hot enough at that point to cause anything to detonate. It reliably gives me a rapid popping until I put on some load at the bottom of the hill. I don't like it. Steven Ayres, Prescott AZ