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The future emission requirements for Transitional Low Emission Vehicle (TELV) and Ultra Low Emission Vehicle (ULEV) will force automobile manufacturers to use extraordinary design measures. Compliance is likely to increase the need for heat shielding. Two system types have been available for some time as design options. These are emission reduction systems such as EGR (Exhaust Gas Recirculation) and A. I. R. (Air Injection Reactor). Both systems create temperature difficulties because of hot exhaust gases. Shielding is needed to insulate other under hood components from high temperature and to retain heat within the emission system. Heat shielding and air conducting tubes have to be flexible, withstand vibration, resist corrosion from the exhaust gas and endure many cycles of heating over the life of the vehicle. Traditionally stainless steel has been the material of choice.