Do you need a different catalytic converter input/output diameter?
If you want a diameter larger than 63.5 mm then just cut the catalytic converter cone in the right one to the desired diameter and if 63.5 mm diameter is too large for the Shadow then you can get the reductions available in the link below:
Universal stainless steel catalytic converter with metal insert. Compatible with diesel engines.
The catalytic converter meets the requirements of the European directive:
Manufacturer's warranty: 12 months or 50,000 km.
KS21
Do you need a larger diameter than 63.5 mm? - Cut the cone in the right place. Want a smaller one? - use reduction:
MO-A20
Do you need a larger diameter than 63.5 mm? - Cut the cone in the right place. Want a smaller one? - use reduction:
KSS11
Do you need a larger diameter than 63.5 mm? - Cut the cone in the right place. Want a smaller one? - use reduction:
KSS21
Do you need a larger diameter than 63.5 mm? - Cut the cone in the right place. Want a smaller one? - use reduction:
DO-A50
Do you need a larger diameter than 63.5 mm? - Cut the cone in the right place. Want a smaller one? - use reduction:
MP25

CP20

MP50L1

MP501

MP-A50
Do you need a larger diameter than 63.5 mm? - Cut the cone in the right place. Want a smaller one? - use reduction:
CO15

MO12

KS11
Do you need a larger diameter than 63.5 mm? - Cut the cone in the right place. Want a smaller one? - use reduction:
CO19

MP502

MO-A30
Do you need a larger diameter than 63.5 mm? - Cut the cone in the right place. Want a smaller one? - use reduction: