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the muffler is the part of your exhaust system that looks like a big box... it's quite a bit wider than the pipes going into and out of it. It's there for several reasons... to filter out some fumes and to deaden the sound. a "catback" exhaust consists of the muffler and all the tubing from the catalytic converter to the tips. You probably want to get a catback system installed, not just the muffler.
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