I had the set on my 202 painted for 2 years with only very slight discoloration. I used VHT 1500degF heatproof paint.
Preparation is everything with the paint
You must like anything your going to paint prepare it properly I used a wirebrush on mine especially around welds etc Next I dry sanded my pipes with 400 (can use 600)freecut.
Next wipe them down with Wax & grease (prepsol) remover and wipe off residure immediately with a clean rag. I repeat the process wtih another 2 clean rags.
Prior to painting I shake the can and heat the can to around 50-60deg and shake the can upside down vigorously prior to painting
Next begin painting I start with edges and welds giving them a very thin light coat once it startes to tack up I give them another light coat and let it tack up.
Next I give the complete extractors another light coat and let it tack up. After all that the paint should only be just seethough except for the edges, now I give it a heavier coat paying particular attention to hard to reach parts first
next allow todry for a while and you can paint again, I end up using a ocmplete can on my extractors. When I painted the exhaust for my 5L I used 5 cans of paint & another one to do a few touchups where they have been marked from workingon the car.
Also when refitting the extractorsi suggest using clean gloves &/or wrap them up any greasy marks on them will affect the paint, also if the car has oil leaks etc it will affect the paint if it gets on it.
cheers
Scott