Originally Posted by DeeBoy
you're right about the gearing, it's a popular mod to change the Final Drive ratio to 3.33, 3.55, 3.73, etc.
as for the interior, it's definitely the dodge parts bin treatment, http://www.venzanoviper.com/
does some nice custom interior work, checkout their gallery.
As far as I can tell, they don't really do too much custom work outside of basically repainting the interior pieces and re-upholstering the seats. I thought it would be a bit more customization that actually upgrades it as opposed to just sprucing it up with color.