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farm4 . static.flickr.com/3073/2610974656_2953858bb2_o.jpg
Here is an awesome slide from a Ford 999 presentation.
Stock 0.34 Cd
lowering car -0.08!! (50mm clearance)
close off cooling -0.025 (as we've seen here)
remove mirrors -0.015 (ditto)
bellypan -0.01
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final 0.21Cd
So, for xA owners, just the first three will have a huge effect vs a complex bellypan fabrication and install. And, at minimum, likely a 0.05Cd reduction for the xA.
It's probably safe to say that getting your xA lowered by any amount, even the small drop going to the TRD xA struts will help noticeably. Shocking though to see the 0.04Cd drop just taping over the front and removing mirrors on the Ford 999.
Notice the 'straight' looking decklid extension on the 999. The xA spoiler might well do something useful...
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