Top Definition
The act of totally removing the muffler and resonator from a vehicle and replacing with straight pipes, thus reducing the restrictions on exhaust flow, and giving the car a deeper, nicer exhaust sound. Usually done when new performance mufflers either do not exist or are too expensive.
Dietrich: Dude, there aren't any sport exhaust systems for my Jetta TDi.

Stefan: Don't worry about that crap, just give it a mufflerectomy.
by VonShroom March 03, 2007

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