Finally today I got some surprising news, I have a tailpipe waiting to ship from Pypes. Got a voicemail from the guy I've been dealing with for the past three & a half years (sounding hesitant since he knows I'm not a happy camper on how this has been going to fix the issue) asking if I still wanted the new pipe as they finally got the corrected tailpipes in. Called him back (shocking him since I did sound pleasant unlike our last phone call) to let him know I do. So now wait for it to come in & toss it on to see if it's a fix or a bust. Hope after it being over thre & a half years since this headache started this is the end of it.