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Also as a further we point, I wonder how much difference to the performance having the vent in the bonnet? I am pretty sure if I did not have it, the ARC would not work as well as I must be getting a lot of air flow through there and as the hot air rises the cold air over the bonnet would I am sure suck a lot of heat out.
A lot I would say G, as we all know cold air is the key and the GM get copious amounts straight from outside with little or no influences from the warm air inside.....when you are rolling that is.. As with the J's and to a degree your ARC with the bonnet vents.
All open cones suck, due to no air flow or putting them in a ridiculous place i.e 1 foot of the floor near a wheel