Mr Vinylman,
Now I don't know if this is the truth, but when I lived in the UK about 12 yrs ago, I read in one of the kitcar magazinesthat you can literally pour and/or dip your pipes' interior with regular 30 weight
oil, clean off the outsides of the pipes and then re-install and go driving as you usually do. They will smoke up a storm for awhile and then after the
oil has "burned in", the interior of the pipes will be coated in a very thick carbon residue that is supposed to act as an heat insulator that results in little or no bluing at all.
Urban legend?? foolspeak?? does it work?? It sounds plausible.... That one person in the kitcar magazine said it did.