I have been running a Donaldson http://www.ebay.com.au/itm/PRE-CLEANER-DONALDSON-3-76mm-/150830638091?pt=AU_Car_Parts_Accessories&hash=item231e34e40b and I think that it's a bit restrictive for the 3.0l turbo. It filters heaps of dust and bug wings but makes a hell of a racket (actualy sounds pretty cool). I have changed it for one that I swiped off of a 75 series 4.2l Landcrab. Will this be big enough. It sounds awesome

So after a week of testing, the Landcrab snorkel top is pre cleaning really well. After following a semi for about 80km on a dirt road, the dust in my air cleaner was minimal and I have more power than I did with thw Donaldson .