Clicking noise from rear of car after releasing gas pedal

[lt2334]

When my car is cruising at around 1000-1500 rpm, if I let off the gas pedal I get this clicking noise from the rear of the car. It almost sounds like when an engine pings. If I repeat the process of giving it light throttle and releasing the gas pedal, it does it again. This is a single clicking noise unlike engine pinging where it is continuous. Any clues if this is normal? I have a 2011 128i with auto. Any help would be appreciated. Thanks

[leesat]

It could be coming from exhaust.
I went to dealer about the same problem and they said
it's coming from exhaust.
Mine does that around 2k rpm.
I think you can find some post about this prob. There was some discussion.

[lt2334]

Mine only does it in gear and will do it at 1000rpm on up. I read the post on when the exhaust flap opens in the muffler at around 3,000rpm, but that is not when mine is doing this.

[jaf89f]

More than likely it is the exhaust flap. I don't think it is the rpm that really controls when the flap opens as much as the amount of throttle you put into it, but I could be wrong. Either way, I unplugged the wire in the trunk that controls the flap and I have never heard the click noise again. You can also refer to the golf tee mod as well. Either way works.