An exhaust system component for an exhaust system of an internal combustion engine, - with at least one metallic first part (3; 18), which is inserted into a metallic second part (2; 17) in such a manner that a jacket section (7; 19) of the first part (3; 18) located inside is coaxially arranged in a jacket section (5; 24) of the second part (2; 17) located outside, - with at least one weld, which connects the jacket section (5; 24) located outside to the jacket section (7; 19) located on the inside in a fixed manner, - wherein multiple centring contours (11, 12) for centring the jacket section (7; 19) located inside in the jacket section (5, 24) located outside are provided, which are formed protruding to the inside on the jacket section (5, 24) located outside and/or are integrally formed protruding to the outside on the jacket section (7; 19) located inside and are spaced from one another in the circumferential direction, - wherein the second part is formed by a bottom, which comprises at least one through-opening, - wherein the jacket section located outside is formed by a rim of the bottom, which encloses the respective through-opening, projects from the bottom and is integrally formed on the bottom, - wherein the first part is formed through an attachment part, which penetrates the bottom in the through-opening, - wherein the jacket section located inside is formed through a jacket section of the attachment part located in the through-opening, - wherein the centring contours (11, 12) centre the jacket section in the rim and are integrally formed on the rim protruding to the inside and/or are integrally formed on the jacket section protruding to the outside, characterized in - that the respective centring contour located outside supports itself on an outer contour of the jacket section (7; 19) located inside, and/or - that the respective centring contour located inside supports itself on an inner contour of the jacket section (5; 24) located outside. - with at least one metallic first part (3; 18), which is inserted into a metallic second part (2; 17) in such a manner that a jacket section (7; 19) of the first part (3; 18) located inside is coaxially arranged in a jacket section (5; 24) of the second part (2; 17) located outside, - with at least one weld, which connects the jacket section (5; 24) located outside to the jacket section (7; 19) located on the inside in a fixed manner, - wherein multiple centring contours (11, 12) for centring the jacket section (7; 19) located inside in the jacket section (5, 24) located outside are provided, which are formed protruding to the inside on the jacket section (5, 24) located outside and/or are integrally formed protruding to the outside on the jacket section (7; 19) located inside and are spaced from one another in the circumferential direction, - wherein the second part is formed by a bottom, which comprises at least one through-opening, - wherein the jacket section located outside is formed by a rim of the bottom, which encloses the respective through-opening, projects from the bottom and is integrally formed on the bottom, - wherein the first part is formed through an attachment part, which penetrates the bottom in the through-opening, - wherein the jacket section located inside is formed through a jacket section of the attachment part located in the through-opening, - wherein the centring contours (11, 12) centre the jacket section in the rim and are integrally formed on the rim protruding to the inside and/or are integrally formed on the jacket section protruding to the outside, - that the respective centring contour located outside supports itself on an outer contour of the jacket section (7; 19) located inside, and/or - that the respective centring contour located inside supports itself on an inner contour of the jacket section (5; 24) located outside.