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them and after almost 3 years, and 24,000+ miles of spirited daily driving, 18 drag strip events, and 2 long road trips to see family; my coated MSP mani's still look great,and ZERO issues with cracking,exhaust leaks,etc.... Using a laser surface temperature thermometer for before and after, there was roughly a 412F surface temp difference before with the stock mani's after a couple hard pulls on the highway and taking a quick reading and after installing the coated MSP's. (granted not a direct before and after comparison of the same manifold type, just sharing my little data for what its worth). To each his own with what he/she feels comfortable doing.
-M.
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