I recently had a Buschur TBE w/magnaflow installed and I hear a distinct buzzing or creaking when I give it some throttle coming from the back especially after cold start. It isn't continuous, just brief (1-2 seconds) during acceleration. Anyone else experienced this?

 

is any part of the exhaust touching the underbody?

 

it could be the DP rubbing against the braces under the car... or its ditting the heatshield.. Rem metal expants with heat...

 

Does it sound anything like the noise when you floor the car in 5th at like 30 mph(pretty much to high of a gear for to low of a speed)?

 

Thats what mine sounds like, only does like around 2k rpms will I'm driving really slow or decelerating.