Hi Pete. My reverb is solid, my passenger feels it through her seat (me too)
Have discussed possibility of a 'created' metal ball from catalyst converter fragments banging around.
I wonder if it is just a fact of life for these engines, but don't know how to ask that question.
The car is 9 years XXXXX, XXXXXe 100,000 k.metres, and has been treated easy. I am 74 yrs of age.