You need to be more specific as all engines have an air intake.
If you mean Raised Air Intake (RAI) or snorkel to most people.
But its not even that simple as landrover say their RAI for the D3/4 is not waterproof so is not really a snorkel in most peoples eyes and I bet their genuine RAI for the puma is along the same lines, whereas just about all the aftermarket ones are true snorkels.
Benefits to your everyday joe are zero, unless you do deep water/mud work at pay and play sites or traverses dusty deserts and the like.
There are some nice looking ones out there and also quite a few copy ones find one you like then get researching on its pros and cons.