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kah, a lot of that is anecdotal. I've heard just as many tuners recommend against heat wrap/coatings because it can increase the likelihood of exhaust manifold failure. The primary (really, the only proven) reason to use heat coating is to reduce engine bay temperatures. Doing so prevents the turbo from heating up and passing that extra heat on to the intake air. If anything, according to a lot of people who have been trying to heat their intake air (WAI) for fuel economy, heat wraps might actually HURT fuel economy.
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