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Body kits are almost never good for drag reduction. They're usually there to look like they give downforce and cooling air and so forth, when usually they just add drag.
The DX is better all around for FE than the Si, with taller gearing and a smaller engine that is not optimized as much for high RPMs. The CX might be a better choice yet; it sounds like the gearing is taller at least.
I'd probably think hard about the CX since you can use a ScanGauge in it to help tune your driving style.
-soD
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