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Should not be a problem since so many 365hp and FI cars did not have them. But I think you meant the 6 quart oil pan prevented use of a damper.
I did mean 6 quart.. (5 in the pan, 1 in the filter?).
I have been running mine without the damper for a few months. I just wondered if there was something I'd missed, or if there might be some long term effect?