I've had a small section on mine flake. Generally though, you'd be hard pressed to shift the stuff. The item is a 304SS weld elbow turbo manifold coated at CIC. The coating does make a worthwhile improvement over non coated. Mine were double coated inside and out in black. I've since wrapped them to further reduce the under bonnet temps. Been running like this for around 3 years now. Would I do it again? Absolutely.

For what it's worth I also had the downpipe and all the aluminium intercooler pipes done too.

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MY00 WRX. 89 Prelude. 99 CRV