Catbacks are the entire exhaust system from just after the catalytic converters back to the exhaust tips. (These systems include mufflers)
I prefer these systems as opposed to just mufflers as you get better exhaust flow and its usually a strictly "bolt-on" affair...
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Uncle Sam
"What the hell is up with all the gauges?
Calling Captain Kirk, your ride awaits... Phasers on stun...."
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