Go ahead and do it. Then do it again, then do it again, then do it again... put a price on your time and the PIA it is, realise that it happened because they are either damaged, defective or worn out, and it's just going to keep causing problems until you put a new one in, and then remind yourself why you didn't take any advice from me. Been there, done that. BTW, I paid $150 for my OEM catted H-pipe.