I also noticed a reduction of wind noise after adding the Kammback and removing the roof rails. Unfortunately, this is cancelled by the increased road noise when driving without the rear seats.
I think that getting your Cd below 0.28 will need more than a Kammback and bellypan. You might need a boattail. A
tail cone like this would be awesome:
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread