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I agree with the earlier posts, rear without the front is a problem, especially at high speeds. I've been searching for the article, but I recall reading that the turbo style rear spoiler adds up to 400 lbs of downforce. The front spoiler on the other hands scrubs off air from going underneath the car, reducing lift. Together, they keep the car planted. If your rear spoiler is pushing down on the rear without a lip to keep the front down, this could cause problems. The lighter front going into high speed turns will lead to more understeer.
When I first bought my SC, it did not have spoilers. At 130 mph, I could not keep the car in a straight line, it would drift left and right from where I was pointing. After adding the spoilers front and rear, it was rock steady at even greater speeds.
If you only drive the speed limit with no track time, I don't think your present setup would be dangerous; just not optimized.
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