depends WHERE the leak is and how much labor to cure it. if near the manifold or the manifold itself, moving the engine out of the way (esp if fr wheel dr) can be labor intensive. if it is a catalytic converter involved, burned out, punched, or rusted thru, i suppose those things are gold... well, no, PLATINUM! i'd get a second opinion on repair. be careful that you don't breathe deadly fumes from an exhaust leak.