Originally Posted by Simann

1. How in the heck does a hollow tube (otherwise known as a "test pipe") "burn out" your exhaust?
2. How does a welded o2 bung (thats not even remotely close to the extreme temperatures primarily exerted on the header tubes and initial flange) simply "break off"?

I think multiple stories on here are bent truth. Secondly, of course you will hear different harmonics resonating from the exhaust, you have no noise dampning effect from the stock catalytic converters. Lastly, if your car is lowered, you openly admit to driving it hard after saying "after all this hard driving", common sense would say that you most likely were driving it like you stole it and ran over something in the road without paying attention and simply ripped the o2 sensor and bung out of the test pipe.