There is very little or minimal that you can do to "break in" a catalytic converter. Usually means a steady warm up, once they're up to temp and they start catalyzing that all there is too it.
Folks that say they've broken them in usually means for resonated components.
Breaking in resonated components means a sound change from exhaust soot/oil/gas coating the resonators as they age. Technically it should lower the sound a bit if it's intact. If it loudens then it means you killed some of the fiber/metal fibers inside the resonators.
|