[darkpuppet]

I can't believe that there's another post stating that the rear lunchbox is a resonator... 'cause the ford parts catalog doesn't think it's a resonator.

FYI

Quote:A resonator (helmholtz resonator) uses a tuned cavity to actually actively cancel out sound. It creates a band-pass filter that eliminates problem frequencies - so they tune it for a specific loud spot in engine operation. It targets only a small range of frequencies.

A muffler is usually a series of expansions that take energy from the gas flow to decrease sound. Sometimes they have resonating chambers built in, but typically they operate on a purely expansive vane - expanding a gas so many times into such a volume muffles certain frequencies.