According to one website:
A short list in car exhaust:
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No, it will just make the car loud.
If the vehicle has a stainless steel exhaust system it will last the life of the car. If it does not and you drive in roads treated with salt it will not last as long. Surface rust does not mean the exhaust in need of repair. Surface rust is normal on a steel exhaust system.
squeeking from exhaust manifold is caused by a leak allowing exhaust gas to leak. it will only get worse as time goes on unless it is fixed
Go to the dealers or manufactures website, they usually will have schematics
Engine,Emission Control System,EGR (Exhaust Gas Recirculation Valve),Exhaust system,ECM (Engine Control Module),