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Not HUGE differences. I have spreadsheets in that zip file that give the specifics. The only one that I noticed was really big was when I put the spoiler on, the lift component went down by about 40 pounds (almost 50%). Collectively, the decrease in drag was like 15 pounds. But, these are all very rough estimates since, like Robert said, rotating wheels are not accounted for and the road is technically moving the same speed as the car (stationary). Also, the shape is very rough.
Robert, I'm going to sit down and calculate that Cd right now. I think I saw somewhere that solidworks can calculate sectional areas, so I'm gonna look for that function.
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