I just bought a new muffler as my old one is completely rotted out. 1990 300TE. I can't get the rear muffler seperated from the center muffler. It is stuck. I have tried heat, penetrating fluid, banging etc. I then tried to undue the center muffler so I could pull the assembly out and have more places to work. I can't get those connections undone. It appears everything is stuck togethor. Please advise. I either need to get this fixed ASAP or sell my 2 seater and buy a bigger car before my wife kills me.