Where are you getting this information?
The M119 EFI doesn't have variable intake resonance, the M113 does.

The M113 did not go into production untill 1998...

I have not seen any changes in intake manifold design on the M119.

Where did you get your information?

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS