LG World Challenge Spoiler Increase rear grip at speed with the new LG Motorsports World Challenge rear spoiler. This is a two piece design with a composite lower portion that comes ready for primer and paint, and is finished off with a true full carbon fiber wicker that can be removed or installed for more or less downforce as needed. This is the same piece as was tested and used on the 'Forza Shootout' car as seen on SPEED TV!! *Requires use of C6 CHMSL*