I bought mine for cheap off a local guy who never used his. I would not pay $99 for this, no.
Also, seems the top-left screw comes within mm of the large empty hole left from the plug of the stock scoop. So there'll be no mounting of a screw in that position for me, because it just slips out.
The Dinan scoop looked like a much more functional unit. I'm wondering why it wasn't a bigger hit? Here's a link to a guy here who installed one:
http://www.zpost.com/forums/showthread.php?t=123811