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Lighter and vvti in later versions. However a 3.4L VZ series motor would mostly negate the vvti advantage.
The 3vz advertises less power, however there's supposed to be a slight mod you can make to the afm to get the 3vz up to 1mz levels.
Also, if you have to do this in california, it should be easier to get a 3vz past the inspection as they won't be looking for half a dozen obd2 items that have to be retrofitted.
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