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To meet ever tightening exhaust emission limits, a new canning system for metallic substrates was developed. The developed system includes half shells that have tortuous locking tongues and integrated air gap insulation. The metallic EcoCat® type substrate is a self-supporting light matrix, having channel shape corresponding to channels of half shells which lock its longitudinal movement and, more importantly breaks the boundary layer and forces gas flow to swirl, improving the heat and mass transfer. With the developed canning principle a complete catalytic converter can be produced by using only three components. The new design has been found especially suitable for light duty diesel applications in which it is essential to ensure maximum working temperature also for the outermost channel layers which are close to the half shells.