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Turboing the 2JZ-GE is not insanely hard or anything, hell, to put a single on a Supra TT you end up having to replace a crap load of parts. But the 2JZ in the IS300 is not the same one found in the SC300 and non-turbo Supras. The older 2JZ-GE has the same strong rods, crank and block found in the turbo version, it's just higher compression. The new 2JZs have much weaker rods and the IS300 uses a returnless fuel system and VVTI, so it's a pain to work with.
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