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There's more than enough air passing by the vehicle to keep a boattail inflated with some type of ram duct, and if it goes limp at low speed,you're probably not going fast enough for a boattail to be effective anyway.
You wouldn't want to fill it with exhaust, because when you get to work, or wherever, and you have to deflate it and put it inside your vehicle, it's going to have residual exhaust in it and it will stink up your vehicle, not to mention the danger of bringing exhaust gasses into the cabin.
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