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Old 02-27-2016, 11:55 PM   #2
samdemange
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Join Date: Nov 2013
Location: Bresse Track France
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hi artem,i have NGK iridium on my trackdays ti (M52B28),working great until 7200 rpm
and you can choose a lower heater grade than the OEM one for better performance and less temp for the head of the engine
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