Ive done 2 and there easy if you know how.
Take pipe off the car and use paint stripper to remove all the powder coating inc brackets.
Once its all removed use wet and dry paper to smooth the metal to a fairly uniform but dull finish.
Then use a metal polishing kit ( i got mine off ebay ) to polish the pipe untill you reach your desired finish.
Refit charge pipe and jobs a good un.
Took me 2 days to polish charge pipe and inlet manifold.