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Yes, I had it done about 2 years ago and have not had issues with the coating flaking off or the colour fading. Had it done blue just to be a little different from the regular run of the mill red
Powder coating normally cures at 200 deg C for about 10-15 mins so unless your engine bay gets that hot it should be fine
It shouldn't flake off unless the base preparation of the manifold is poor
Look in your local area for powder coaters.
Powder coating is very hard wearing but it's all down to the preparation of the surface to be coated (removal of oil,soil,greases etc)
Only the newage sti manifolds must be powder coated, as the with the classic you just needed to look at the inlet manifold funny and the paint would flake off