Quote:
Originally Posted by Rotzy
It is not possible to "revert back to the OEM sound" unless you reinstall all the parts that were removed! Over time, the "tone" of an exhaust system may change slightly as mufflers wear in. However, in this case there are no mufflers and the remaining exhaust parts (resonators, cats, etc) are already "broken-in". Physics dictates that the volume of the exhaust will not change simply with the passage of time.
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Not simply a factor of time elapsing, but the theory was that the engine was behaving differently in an effort to control exhaust emissions and the resulting adjustment left the exhaust note muted again.
I'm probably explaining it all wrong, but something along these lines.