I've had experience with both, our D4 has a Safari Snorkle and a mate has the RAI, the RAI makes a sucking noise, although not really bad, and usually only heard when the drivers window is down, it can be heard under heavy accelleration with the window up.
 
My personel opinion is they are pointless if they are not sealed, which they aren't, what is the point of a perferated tube from the airbox and not sealing them at any of the joins or at the airbox
 
Defeats the purpose of Raised Air Intake if it's sucking air from under the bonnet 
				
			 
			
		 
			
				
			
			
				Cheers Baz.
2011 Discovery 4 SE 2.7L
1990 Perentie FFR EX Aust Army
1967 Series IIa 109 (Farm Truck)
2007 BMW R1200GS
1979 BMW R80/7
1983 BMW R100TIC Ex ACT Police
 1994 Yamaha XT225 Serow
			
			
		 
	
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