I tried a rear belly pan and it sealed nicely. But the angle was way more than the 4 deg required so i didn't get any real benefits from it. I had a curved sheet of aluminium covering the rear axle to seal it off but the axle hit it a few times when the suspension extended after some speed bumps etc. I haven't put it back on yet due to it being freezing cold here. Thing is, if i lower its angle to 4 deg it will be a lot lower than the lower edge of my rear bumper. Getting it to look the part will need some thought.
I'll post pics i promise.
ollie
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