Just did a quick bit of reading and there have been mixed results.

A lot of it depends on the quality of the job and how well the headers are prepped.

However quite a few people in the UK have had it flake off after 6 months of competition use. Though some are saying theirs is still good after 18 months.

Not sure on prices here but in the UK its prohibitively expensive as in almost $200 just for a turbo exhaust housing.

Reading on the UK forums the Consensus is coating for looks and longevity wrap for efficiency as it does a better job of keeping the heat in.

__________________
605whp
Quarter Mile in 10.9 seconds @ 135mph /217kph
0-100 kph 3.2 seconds