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I've done some digging around for more info on manifold and exhaust wrap. It seems very popular with performance modders, and should be very beneficial on turbo engines, adding low rpm torque, while not doing very much for high rpm horsepower.
What is generally advised is to use e special silicone sealant, on the manifold before you apply the wrap, and on the wrap once fitted. This should greatly reduce wear on the manifold.
Other than reducing the temperature under the bonnet, the extra low rev torque would likely increase FE. I might check it out in a couple of months, but it seems like quite a comprehensive mod if you have to take out the manifold to fit the wrap.
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