Those are one of the funniest things that Arospeed makes only behind the winglets they make to add on to your aluminum wing.

 

One of the guys on FocalJet installed one of those on his ZX3. He swore it made the car stiffer but then a month later he was selling it. Guess it is all looks.

 

japanese company DO-Luck makes those in polished for 240s. they actually work and you can tell its stiffer but to get the real effect you have to have the front and rear braces as well as the sway bars and spring/shock setup to make it all actually do something.

 

yeah im sure they do something its just not very nessesary

 

for me those red Xz look just great>