just added these this weekend to my z. easy to install and they look great....cleans up the open spaces back there. my butt dyno says at least 20 hp and they really stabilize the car when you hit higher speeds (above 100).....no really....i am dead serious about this mod....highly recommended for those looking to just spend money

 

You got pics, what exactly do these things do?

 

no pics of my own...but there are some on the site somewhere....suppose to beneficially redirect airflow under the car....they come stock on the track model