Sixto,
As Jim mentioned, the EPA work was to install a EGR recycle valve to make it look just like the US models. As for the seats, they were supposed to have "reinforced" backs and the keys I frankly couldn't tell you why they had to be changed. To be honest, I don't think they were changed....
Regards,
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'06 E320 CDI 51K miles
'02 VW Jetta GLS TDi 120k miles
'99 Ford E350 7.3L Powerstroke 200k miles -sold
'84 Euro 300D 5 spd manual 317k miles - sold
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