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I would say it would depend on the quality of the wrap itself.

There is alot of cheap and nasty heat wrap on the market at the moment, that I would be lucky to put near NA extractors, let alone a turbo dump pipe.

Buy some good quality wrap, which will cost a abit, and it may even have a heat rating on the packaging or manufacturer specs may provide the ratings.

Apparently, because the heat cannot dissapate as quickly, the properties of the steel may change.

I didnt have any problems with my dump being wrapped (mild steel), after 12 months it was still perfect condition, visually. I didnt really have a choice, as the underbonnet temps were pretty crazy :(

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