Patent ID: 8839517

Claim:
A method of forming a catalytic device for a vehicle comprising: disposing a catalyst substrate in a shell between an inlet and an outlet of the shell, the shell having a first portion proximate the inlet, a second portion proximate the outlet, and a portion between the first portion and the second portion, the catalyst substrate comprising a flow through structure in fluid communication with the inlet and outlet and an outer surface surrounding the flow through structure that faces an inner surface of the shell, the outer surface having a first end; disposing a mat between the outer surface of the catalyst substrate and the inner surface of the shell; and spin forming the shell when the catalyst substrate and mat are disposed within the shell between the inlet and outlet, the spin forming comprising: compressing the portion between the first portion and the second portion of the shell to compress the mat directly against the outer surface of the catalyst substrate and the inner surface of the shell, and forming the first portion proximate the inlet and the second portion proximate the outlet with a smaller dimension than the portion between the first portion and the second portion, the forming of the first portion bending the first end of the outer surface of the catalyst substrate toward the flow through structure to retain the flow through structure, at least in part, via the bent first end.