Quote:
Originally Posted by jakobnev
It may, but it is ruining the effectiveness of the stock spoiler so it's not certain at all.
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Does the rear spoiler cause much of a change in angle to the rear hatch slope?
I've never looked at a Prius with this in mind, so I am not sure. If the spoiler is just a continuation of the hatch angle (or makes it only very slightly shallower) then it will do nothing / very little to reduce lift.
Of course, if you want to get rid of nearly all lift, place a fence across the mid-point of the roof!