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I've found heat wrap was horrible, got a decent brand, wrapped my manifold, was itchy as hell to put on ( my arms were bright red by the end of it) didn't make any difference, still got hot and after 3 months it cracked my cast iron manifold.

what is alot better is making a heat shield out of heat reflective materials, bunnings sell the stuff and cut with a tin snip, that I did notice a difference that my intake pipes stay cool/lightly warm and oppose to roasting.

For the stock manifold I trimmed the stock shielding to clear the gt 30 housing and it works great. For the dump pipe I used fiberglass wrap from Repco. Itchy yes, just man up. But after wards under bonder temps were lower, and I can physically touch it after long drives so it does work.

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