Ahh ok - jumped to the conclusion a 3sgte was involved ..
if its not beign used for intercooling there isnt much point .. having some bonnet vents to expell heat would provide benifit though - something tasteful at the back like an XR6 style or cosworth grill
a scoop would provide air directly down on the motor but would also possibly cause the bonnet to lift if it had no where to escape from there