The Kjet m103 is a pathetic excuse for an engine even in the small w201 body. Switching it to EFI was a huge improvement bit it still lacked the low end torque and ease of maintainance of the M102 8 valve in the same body. I would hate to get stuck with a 3.0L m103 in something heavier like a w124 or w126. The om603 has torque down low where you need it to get moving even before boost.

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CENSORED due to not family friendly words