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All this talk of ram air makes me wonder if the opposite isn't true at the other end..?
ie: Where's the lowest pressure area at the rear of a car? And why doesn't the exhaust exhaust there..??
Yes it's all about keeping CO low, rather than smothering fellow motorists, but perhaps one of those exhaust valves can be made to work at higher speeds where it will be useful.
Hmm... you'd likely want the exhaust sealed where it goes through the rear panel.
Not so easy..?
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