I painted the canisters and tips with high temp paint from Home Depot. I made sure they were clean and scuffed them with sand paper. The finished product looked great and lasted through 3 MN winters.
'08 E90 M3 - Alpine White - Sold
'13 E92 M3 - Silverstone II - Sold
'04 E46 M3 - Jet Black - BBS E88, KW Clubsports, Brembo BBK, SuperSprint Exhaust, Recaro