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Registered
Join Date: Aug 2005
Location: Fort Collins, CO
Posts: 332
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In the specific case of the water-cooled M96 engine, I would think that airflow would be less important for heat dissipation from the area around the sparkplugs than would be retention by the black coilpacks of excessive heat radiated toward the area from the exhaust system if the guards are missing. The guards are not tight up against the coilpacks when installed and there is a bit of clearance for air circulation.
I cleaned and polished my guards before I re-installed them so they would be better heat reflectors.
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2015 Porsche Macan S, Dark Blue Metallic
2011 BMW 328xi, Crimson Red
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