You can drop in a 4.6 either GEMS or otherwise, but you will need a computer system a lot more sophisticated to piggyback your ECU than a couple of chips (Motec preferably), or, you can stroke your 4 litre out to 5.2 (4.7-4.8L is best), if you wish, however, either whichway, you are going to be up for big bucks.
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No hand signals, driver playing with his transfer Knob.
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