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The telltale signs the a muffler needs to be replaced include a louder or throatier exhaust, a lack of back pressure from the tailpipe, deterioration of baffles within the muffler, exhaust entering the car and/or decreased gas mileage. If you notice one or more of these signs, you should take your vehicle to a licensed mechanic immediately.

If your car sounds like it's a lot louder than usual, or if you hear a "clunking" sound coming from under the car, your muffler may need replaced. Grab the tailpipe (when the car is not hot) and see if it wiggles a lot.

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