The alda for this car didn't work, I dont think. I removed it and got great power. I then tried to reinstalled the alda, even with the screw all the way out it was dead slow. As far as I know they are all the same or very similar.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D