The stringent emission regulations associated with the ecological and economic competition in the automotive sector have forced the OEMs to adopt a continuous improvement approach in optimizing the energy efficiency of the vehicle, which demanded a faster reach of the light-off temperature of the catalytic converter (to be able to decrease the emissions), and the usage of a lighter material. The result of the increased efficiency is a higher exhaust gas temperatures up to 1000-1050°C, where the conventional cast iron exhaust system components in the hot end are not efficient anymore, and inventing a new material that is able to withstand these high temperature while keeping a good mechanical properties is a must, as well as the increase in the warranty period up to 10 years demanded a material that has superior corrosion resistance.