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Originally Posted by Otto
The plastic bumper cover is flexible: You can pull it outward an inch or so with your hand so that it is flush with the outer tire surface.
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I'll try to do that and see what i can do with original bumper cover. Thanks.
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Also, you can lower the car by cutting some of the front springs. On E34 BMW cars, cutting one turn off the bottom of the spring will lower the car by ~25-40mm.
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I don't want to lower Berta, she's low enough for polish roads
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If you pull the plastic bumper cover outwards and heat treat it to stay out or used a simple strut to hold it out, and also lowered the car by cutting the springs, you would not need the air dam.
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I think I'll go into the air dam direction with belly pan, because I want to flatten the belly of Berta. You can see here
Three levels of Berta's belly that there are few things that can be improved.
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You could also make an air curtain like the latest BMW 3 series cars have, by ducting ram air from the nose to a vent at the upper forward section of the wheel arch.
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I'll try to find some details. But I have ducts from the front to the wheel arches, but those are for cooling the breaks.