how much to install a muffler
1 A how-to video demonstrates what is involved. 2  An after-market muffler can cost $30-$200 or more, depending on the make and model of vehicle. 3  A CostHelper reader in California reports paying $46 for a do-it-yourself muffler installation. Minor muffler repairs (such as welding a loose but still functioning muffler back in place or fixing broken clamps) can cost $30-$500 or more, depending on the specific work done and local labor rates.