Are they both rattling? How badly.

In my case, there was a faint rattle on the left side. My indy looked at it and was guessing the cats. I went round and round thinking about what option to choose, OE or aftermarket, cost versus quality.

Then, to my surprise, I pulled the exhaust while I was rebuilding my shift linkage, and when I put it all back together again, the rattle was gone. That was over a year ago. Maybe give it a try. It's cheap compared to new OE cats, which is basically the only real option in terms of fit and quality. Nothing else sounds like a good option.

I talked to Mike Miller of Tech Talk in the Roundel, and with a guy I know at Korman, and they both had to admit that the OE cats are really the only way to go, they are just really pricey.

Best of luck,

R.