Should have explained that the centrifuge I mentioned is a proper diesel purifier - same like is fitted to ships - flow rate about 900l/hr! I would also just stick with new toyo filters and a spare. With filters with a lower micron rating you might even get problems with the pump not getting enough fuel... or more likely you might run out of filters!!! Just try and not take the last few litres from a drum. One thing I was considering is a bag filter like is now commonly available for biodiesel production - you could put it in your filler neck and get a pretty good idea of what is going into your tank. As they are also available down to very low micron ratings you could really clean your diesel (never tried it, just an idea), and you are not restricting or changing the cars original fuel system

So long as the car is starting fine (especially when hot) I wouldn't even worry about it - personally I would get a professional to adjust the pump (if it is required/recommended) but that is all. But I honestly wouldn't be playing with boost pressures on an expedition vehicle. IMHO it just isn't worth it. I know it would probably be fine, but I would always be a bit concerned... Like Roman says, it if isn't broke, don't fix it!

"I just find the LR's beautiful and Toy effective"
Absolutely correct!!! I find that the 80 looks a bit bulbous, solid car though... We (a natural resource company in Ghana) have tried 'em all - Patrols, Landys, Hilux, Nissan p/ups, Pajeros etc. The L/C just beats them all. We finished overhauling an HZJ75 pick up at the weekend... 9 years use, NONE of that on asphalt, all of the time used by mechanics going to 'bush' day in day out.

Cheers,