Marc c, I don't know what happenned to my original cat because the indie was only too interested in changing the whole set which costed me a huge sum including labour. Something like A$800 to 1000. Could have been more, but he also did other necessary things too. I can only guess that it was caused by high speed driving on highways without speed limits. I cannot think of any other type of abuse. Maybe some saloon racing also. This car looks like it has not been modified, but when you step on the acc, sometimes it goes like the hell and makes a loud roar. Oh well its only 1799cc!