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Since many years now, environmental regulations got stricter and stricter, leading modern engines (both Gasoline and Diesel) to integrate more depollution devices, to fit new emissions limits. Moreover, the CO2 emissions regulations led also major powertrain improvements in various fields like friction reduction, weight saving, but also engine specific power implying often higher turbocharging rate, with higher temperatures and higher flow rates. As a direct consequence, modern engines have increased the core value of the exhaust line with more complexes and fragile after treatment devices, while working conditions have ran tougher. Therefore to guaranty long term reliability for exhaust line and even making it smaller and lighter is a new objective. This is confirmed by Environmental Regulations which now requires durability threshold for depollution devices.