Doesn't make sense to open up that "designer" vent. On the trailing half of the hood, it will try to force air down into the engine bay at speed. The only aero "benefit" from that is to increase turbulence & lift under the front of car. Now, if you cut your own new vents on the leading edge of the hood, you'd be on to something...
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M850i Vert with RaceChip
E46 M3, Euro Headers, Rasp Pipe, Kassel Tune
Alpina B8, zero performance mods
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