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Originally Posted by jim83
...can someone explain what the differnce is between the variations...
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The US-spec model has larger injectors, a longer-duration intake cam, and larger turbos.
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Originally Posted by jim83
...how easy are the to mod...
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Very:
http://www.mkiv.com/techarticles/index.html
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Originally Posted by jim83
...i wanted to mod it up to 500bhp but i was looking at ten grand to do !!!! if i want to get this kind of power out of a supra what mods would be needed ???? will i have change the internals ????
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No, you will not have to change the internals. Do you mean 500hp at the crank or at the wheels (I've seen conflicting definitions online for "bhp"...and according to SAE, "bhp" is an obsolete term). For 500 at the crank, all you'll need is 'bpu++++' modifications. For 500 at the wheels, you'll need a small single turbo. You'll also need to run some race fuel or water/meth injection.