How do I measure catalyst size?

How do I measure catalyst size?

1.Measure the diameter of the catalytic converter

If it is not convenient to measure the diameter, you can use a string, wrap it around, and measure its circumference, the circumference / 3.14 = diameter

2.Measure the length of the catalyst, taking care not to exceed the oxygen sensor bore

On the left is the catalyst outer diameter size, and on the right is the ceramic core size