If its a 2000 model you should get the THORE engine with the Boch Motronic ECU - a lot better than the earier 4.6 engine, more power and diagnostics that let you see exactly whats going on. Vast difference, even the spark plugs (diferrent size) and coil packs are uprated. If you can get a good engine (have a friendly diagnostic person with the proper kit to check the engine and other systems out before you purchase. The amount of diagnostic info on these engines is brilliant with ECU upgrades and loads of info on all the operations, fueling, 02sensors, lamda, electrics - advance retard, load, each cylinder fuel/air, adaptions etc etc etc etc