"Hump" Spoilers Available?

2006 Sport without a spoiler. Wanting to add one, preferably with the hump. I searched the forum but don't seem to be any listed, or many recent posts on the subject.

Anyone know where I can find one that is not too pricey? OEM or aftermarket okay.
 
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I've noticed my little spoiler directs rain down onto my rear window at highways speeds, probably helps clean that window. A dealer told me the hump is supposed to increase that effect, perhaps it wasn't enough at lower speeds? The hump looks massive, I'd hate to have to load a canoe over that often. I wanted to find a 4R without the spoiler, but I do like the LED stop light, over the incandescent without the spoiler.

My wifes wants me to replace the missing spoiler on her Land Cruiser, so I assume they look cool. I think an ARB bumper and sliders look cool, but what do I know?
 
Here's another thing that I think the hump spoiler does.

On the 2003 Sport we had without the hump spoiler, exhaust would be drawn into the cabin anytime the rear window was down.

On our new 2008 Limited with the hump spoiler, I do not notice it one bit.
 
I'm pretty sure the hump pulls more air down to redirect the exhaust gasses away from the back window like sheik said. I have a '04 with no hump-spoiler and when the window is down while driving, the smell is horrible.
 
The humped spoiler does bring more air across the back window. I've noticed that my back window is cleaner than 4Runners' without the hump when it's snowing.

The humped spoiler is effective enough for me that I've never used the rear wiper. It might not look good (to some), but it's functional.
 

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