I'm about a month away from purchasing my next Benz and will be looking for a W221. I see a lot of gripes online about the intake manifold linkage for the M272/M273 engines, but most seem to come from the lower-end models (eg W203). Is there a chassis break or model break where the manifold was updated to remedy this issue? I've searched through this site and another, also looked through the EPC (seems to be just one P/N for the whole W221 run), just looking to see if I could avoid this issue.