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Originally Posted by DavS1
Tbh I doubt it, as said before the E92's under bonnet is well sealed to keep heat in so the under bonnet air will be hot regardless, it might help but won't ever be as good as std airbox as it is fully enclosed and has it's own cold air feed from infront of the rad. You just need to look at the effort to get cold air to realise it has to be worthwhile.
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I've considered the cold air feed from the centre vent and decided that by cutting the original feed pipe in half I can pipe this into the 'to be sealed' are of the heat shield, thus keeping this feed of air.
Anyone got any opinions on best easily available, most effective, easy to shape, material to build shield from?