According to Angie's List, the cost of an exhaust system repair can range from $100 for a muffler replacement to $1,500 for more extensive work, as of 2015. The price of parts varies considerably, as does the time required to fix different types of problems.
Exhaust systems are complex and made of multiple parts. Unlike transmissions, alternators and other components, however, exhaust systems are typically made of parts than can be replaced without having to replace other parts. Estimating how long a particular job takes can be difficult, as manufacturers place parts in different spots. If the part is easy to access, repairs generally don't take long, but some parts might require disassembling other components.