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The flaps don't "restrict" airflow in the strictly mechanical sense but they do "tune" the pipes (as Mercedes discusses in the manual). A resonance restriction is just as effective as a mechanical restriction in reducing air flow. In any case, the OP may actually have some other problem, but in this engine the flaps are one of the items that must be checked.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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