Bad replacement cat

No there is a campaign for jus that specific y pipe problem you have to check at the dealer for pcm programming anyhow as most garages can't do it. If your truck is included in the campaign they will replace y pipe and reprogram for no or very little cost to you. I'm sorry as I forgot to look for that under your original complaint/question after you sent the last email I checked. We aren't all in fallible you know. We make mistakes as well but you should go after the double converter install it should not have been done. And the original rattle could have come from the y pipe as well and not converter.