How much does it cost to replace an exhaust system on a Pontiac Sunfire?

This is going to depend on what degree of quality you demand in a muffler, and how much of the system needs to be replaced. If you need new pipe from the header on back, and you need to replace hangers, it's going to be real expensive.

I'd take the car in to a muffler shop for an estimate and go from there.

FriPilot