Mate i repainted mine lastweek.
I went to Bunning and bought a can of White Knight, heat proof paint, i chose gun metal.
all i did was removed the extractors, rubbed them back with steel wool, and painted them.
I gave them about 3 coats and the look as good as new.
im a powder coater so i took mine to work and sand blasted them. i got some heat proof paint, sprayed them then sent them threw the ovens a few times to cure them. you can also cure them by letting yor car run for a while till they get hot then let them cool down. if you dont cure them the paint will blister. and the finished result looks alot better than the rusty look they had before.
I too painted mine a while ago with heat proof paint but I found in preparing them that it was very difficult to rub them right back as where the four pipes go into one, there are places I just couldn't reach. They were a little rusty to start. As a result of that poor prep work, they are now pretty crappy again. I guess blasting may be the answer unless there is a dipping process out there somewhere.
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