I have to admit, I'm a player. IMHO, everyone should be able to get on here and discuss how they are making it "thiers" - the essence of what Americans have been doing to their vehicles since they were invented. Someone mentioned the cost of these LR's. Well, as you drive home tonight, look around and count the number of full size diesel pickups. Those guys are spending as much or more than you did for the LR3 (I've got a good 60K into mine). And every single forum there is for them is full of guys figuring out how to change this and change that. Many products have been invented from those ideas just in the 6 years I've been on them. There are very few aftermarket products available for the Land Rovers (at least in the US), and there wont be unless people take the initiative to get creative, and show that there is a market for them.
Everyones use of thier vehicle is going to be different, and if we can provide input that with assist another member figuring out how to achieve something, we should do just that. I can say for certain that I will never, ever take our LR through water that is more than a couple inches deep. So I have no need for an enclosed intake system, and I am sure there are many others out there that are in the same boat .
Rightly said regarding the dyno numbers, increased MPG claims, and filtering on aftermarket intakes. 99% of it is sales hype. There's a huge difference between different filters and their flow rates and filtration levels. I personally run an oiled filter with an outer sock - this has proven to give me the best flow and most protection. Most filter systems will not increase your HP or improve your mileage enough to be measureable. They can improve responsiveness, however (change the shape of that dyno curve). Another thing to keep in mind is that a motor is a closed system - stuff in must equal stuff out. So making the intake better only works if your exhaust has the ability to move that same amount of air out. FWIW, K&N has one of the worst records for filtration. Several motor companies in the past have warned against thier particular brand of filters (Cummins and Navistar). But that was back in about 2002.