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Mr. Muffler Auto Service Center We at Mr. Muffler are very pleased to have been serving the automotive repair needs of the Johnstown and Duncansville areas for more than 30 years. We hope to continue serving you with the honesty, quality workmanship,and reasonable prices that we have enjoyed providing since 1978. We are very glad that you are interested in our services, and we hope that you continue to come to us for all of your automotive needs.