Originally Posted by 2boltmain


I have wondered about this product. Obviously this is meant for unused headers because how can a used header be cleaned sufficiently internally for proper adhesion?


Could likely clean the inside of a dirty used set by using pipe cleaner brushes combined with spraying down each tube with an aerosol solvent. Exhaust soot can be pretty stubborn so just solvent without the brushes may not accomplish much. I imagine it would be a dirty job as well.