WildWill - On my previous Disco 2 V8, my first LR and still a novice to LR, I done all sort of things, changes to the heads, free-flow, chip change etc, cost me R12K at the time, in my humble opinion a total waste of money as there was no remarkable increase in power, neither any significant fuel saving. R12K can buy an awful lot of fuel, even a the current ruling fuel price. I recommend just a few basics, like a good air filter system, correct spark plugs (stay to the LR spec, do not deviate on this), and replace the viscous fan with a good quality electric fan, throw-out the cats, and add good free-flow system, and enjoy the V8 growl. Still by far better than a stinky oil-burner smell early in the morning in your garage, by the way, I think this forum was created just for diesels as about 90% of all topics goes about diesels. I enjoy my V8, and the sound, nothing that beats that.
Sorry to the oil-burner fans out there, no offense, my two cent comments!