if you can afford it mate your going to be alot better off with an enclosed unit such as BMC, Raceland enclosed, Green enclosed, Piper-X viper.
all the cone filter will do is make a big noise when your foot is flat to the floor and suck up all the hot air in the engine bay up into the throttle body. which will, if anything, reduce your performance.
if you are dead set on getting one then you would be alot better moving it to the front of the engine bay where there is a greater air flow of colder air. but imo by the time your have done that and spend the cash on the pipes needed to do this then your might aswell have bought and enclosed filter.
ps. an enclosed filter basicly mean that the filter is not open to the air in the engine and therefore does not soak as much heat up from the engine