http://www.jet-hot.com.auis in Castlemane vic. I had some exhaust bits done. Got to say, price was reasonable & the service was great You're right in what you say re the heat wrap. It's also known to crack the metal due to the different rates of cooling etc. The better solution is the thermal ceramic coat. There are the basic coatings, show coats, marrine coats and then the high performance coats. As you can expect the higher the coat performance the higher the cost, but as I said, the costs aren't that high. If you were building a race car and it was full tit at all times, you'd obviously use the 2,000c super coat straight up. Thing I came to realize is that most if not all A/M headers are coated from factory with a ceramic coat of some sort, and after time it oxidizes. A higher performance coat will probably last a little longer for 25%-50% the cost, but its really the heat cycles that do the damage. eg, cold starts etc. I've just stuck with the base ones for now, I'll see how the rest go as time goes on. Re the turbine housing, I would have liked to have had that done, but not to be this time just yet. For the housing you'd probably put the best coating you've got on straight away. If you're worried about heat, a blanket under the shield might be the better way to go for now