Serving Barnhart, MO and the Surrounding Areas. Jims Muffler and Brake | Auto Repair Shop | Barnhart, MO. Getting your car fixed doesn'have to be stressful. Serving Barnhart for over 35 years, Jim's Muffler and Brake offers auto repair you can trust. We're all about building relationships and making sure you're satisfied. Way back in 1980, we started as a shop that handled all type of muffler and exhaust issues. As time marched on, our customers asked for more. Today, our ASE-certified mechanics offer full-service auto repair of all makes and models - both foreign and domestic. We specialize in a wide variety of auto repair services. Custom dual exhaust Import specialists Trucks, vans, motor homes 1 1 / 2 to 3 custom pipe bending 4 and 5 diesel exhaust Aluminized muffler and pipes Brakes Shocks Struts Front ends CV repair Converters Oil, lube, and batteries Tune-ups