Sorry but I think closing that hood vent is a stupid idea. I am sure BMW engineers know 1000x more than just about anyone on here when it comes to designing an efficient intake. A V8 that revs to 8300 rpm and makes 104 hp/liter needs a good amount of air otherwise the engine would run out of breath far earlier. There is a reason the vent is there.
2012 Audi R8 V10| 6MT| Suzuka Grey| Dallas Performance Stage 1.5 Twin Turbo| 817whp pump| 950whp on 109 octane| GMG springs| Klassen M52R| Toyo R888R| GT Tails| GT wing| Black Optic Grille| Satin black badges
2015 BMW X5 35d|Mineral White| Mocha
2017 BMW M3 ZCP| Mineral Grey