The passenger seat is worth every cent. It's a little thicker than the stock pillion so it provides a bit of back support. As far as passenger comfort goes, if your girl is small it should be just fine as its the same width as the factory piece. I won't go into specifics(she would never read this but...) my girl is pretty small, she says its great but the backrest could be a couple inches taller. She says she doesn't feel secure if I accelerate hard.
You can see the thickness of it in this picture.
Here's just another shot of the back of it.
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My two-wheel toy 2014 Cross Country 8 Ball- Witchdoctors Outraged bars, Lloydz timing wheel, Lloydz air filter, Thrush mod, PCV, paint by me/Sure Shot Custom Airbrush & Graphics/Rogers Custom Auto, RC Components Savage Eclipse wheel, Beacon LED headlight, RICZ lay down license plate bracket, RF amp and Alpine 6.5's
2014 Dodge Challenger for my four-wheel fun.