I'm not painting my pipes with reg paint, I want to know what hapns when reg...

Regular paints (not designated as high temperature) will bubble and blister at high temp and can even catch fire. I'd recommend removing it with steel wool and a good paint remover (with the exhaust cool as paint remover is also very flammable). Then wash the surface with soap and water and dry before using a high temp paint. (one that is designated as an exhaust paint.)

Go with a light color (silver or white are best) as dark colors will hold in the heat shortening the life of the pipes and the engine. (The exhaust system is actually a very important part of the engine's cooling system, acting as a heat sink to help remove engine heat. That is why pipes over time develop discoloration starting where they connect to the engine.)
 
I'm not sure what you mean by "regular paint" but most automotive paints will not stand up on high temperature exhaust pipes. It will burn and peel off. There are high-temp finishes available that will work on exhaust pipes and headers. You could try paint specifically made for automotive exhaust headers, or maybe have your pipes powder coated with high-temp ceramic coating.
 
Depends on which pipes you are talking about.

Header pipes: Regular paint will not hold up. Depending on the type, it will bubble, crack, or peel.
Tailpipe: Regular spray paint will hold up to the temps. Painting it black helps to hide it a little if it can be seen. Or paint it silver to cover the welding bead.

It will only run if you don't prep right and apply too much. It will not crack the pipes.
 
if the pipes are crome you must de-crome you could sand blast.after pipes are de-cromed visit local auto store you can bye high temp header paint follow directions you should be good to go.
 
if the pipes are crome you must de-crome you could sand blast.after pipes are de-cromed visit local auto store you can bye high temp header paint follow directions you should be good to go.
 
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