Originally posted by BAV1
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You will need to fit rain catchers or some kind of deflectors so water doesn't drown any electrical connectors, but if you get genuine bonnet vents from an Astra GTE for example, they have water drain off sections that you fit to the underside of them anyway.
Removing the cover from under the bonnet doesn't make engine noise any louder, but the bonnet will become a heatsink top disperse under bonnet heat. It doesn't so hot that you can fry an egg on it though, so the paint isn't affected.
Another thing you can do to let engine heat out quicker is to pull off the rubber 'skirts' between the chassis rails and the inner wings.
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