Honestly speaking, this kind of spoilers that are flushed into
the boot are not as effective as those "ironing board" spoilers
fitted to cars like Evos and Subies..I think the only way to
achieve good downforce from a spoiler and yet not spoiling its
aesthetic, it shall only be the pop-up spoilers like those on
Bentley Continental GT/FS, Gallardo, Veyron etc.. 