I recently got an oil change at Monro and they told me I need from the catalytic converter on back replaced.. There is visible holes in both mufflers and the catalytic converter is leaking.

To save money I would like to order the parts from Advanced Auto and take advantage of their $40 off $110 promotion currently running and then have a local shop install them.

I'm just not sure what I need to buy.. any help?

Thank you