In lots of engines the difference between emissions standards is calibration. One of the cars here in Australia lasted through a few variations of standards by going from
DOHC Dual VVTi
DOHC Dual independent VVTi (software only)
DOHC Dual independent VVTi with slightly more squish area and a new inlet manifold
That was enough to take it from Euro 3 to Euro 5
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Originally Posted by Crazyrabbit
In God we trust. All others: bring data
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