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The stock 0.45” hex grille has 81% open area vs. 77% for the 0.25” mesh—only a 4% reduction. Over five years, my coolers were about 50% blocked from debris damage, suggesting roughly a 10% loss in flow per year with the stock grille. From what I’ve seen over the past year, the 0.25” mesh rejects ~60% more rocks and debris than stock with no increase in temps on the track or at road rallies.
ShelbyFlyer ran an offset mesh that likely reduced open area by more than 4% and saw no increase in oil temps on track, which gave me confidence to switch to the 0.25” mesh.