I know that for the most accurate "clinical" readings, that the Pyrometer thermocouple should be mounted before the turbo.

I really don't feel like removing my exhaust manifold to drill tap and possibly crossthread a thermocouple, I'd rather weld the bung in my downpipe, What (if any) difference in tempurature readings is there between the two that makes PRE better than POST?

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2002 E430 4matic (212,000km)
2002 ML500 'sport'

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