22-05-2012, 11:55 AM
Id suggest that it is the down pipe ever so slightly tapping the sub frame where it passes through and under the car to the cat. I had this problem before still turnt out to be the engine moving to much and cousing the loose exhaust to catch

![[Image: DSC_0190-Copy_zpsf093f84d.jpg]](http://i1038.photobucket.com/albums/a468/167gti8/DSC_0190-Copy_zpsf093f84d.jpg)