The purpose of this project is to perform a comparative study on corrosion resistant behaviour of stainless steels currently used in industry. The three corrosion mechanisms commonly occurring in the exhaust system include high temperature oxidation, acid condensate corrosion and sensitization induced intergranular corrosion. To compare the materials thoroughly, high temperature oxidation testing, acid condensate testing and potentiodynamic testing was conducted. From these tests pitting densities from the acid condensate tests, double loop polarization curves from potentiodynamic testing and mass losses and gains from high temperature oxidation testing has been acquired. A ranking system was then put in place to incorporate the materials performance across all three tests to rank them accordingly.