For sale is a set of used Berk High Flow Cats. I don't know the exact mileage, they have been on Black Betty for a long time so lets say about 50K miles. The driver side cat developed a crack near the mounting ear and it was repaired at a local exhaust shop by welding it. It does not leak. See the welding bead in the photo. These have an extended O2 sensor bung and do not throw a CEL code. There is some steel wool inside the bung, you can use it as is, completely remove it, or replace it with new wool if you like.

$250 + shipping OBO.