Yawar, I discussed this item with few members earlier but some of them didn't recommend it for these reasons:
1. They don't last long on Viper's skin.
2. When removed they will leave visible scars on Viper.
Though there is a clear utility in the following sense:
1. Stops rain even if the windows rolled down an inch or so.
2. In summers the gap between rolled-down window and door is concealed
But my experience in the XLi, GLi was that they make noise at higher speeds such as the motorway ad don't necessarily improve the aerodynamics. I think such extensions would add to protrusions in the aerodynamics of Viper, I may be wrong though. But lets discuss it further.