I can see how that would happen. Think of the whole car as a unit, then adding the spoiler could do some odd things with that entire unit. Like VGs do on aircraft wings at certain angles of attack, or really small speed brakes kill significant lift.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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