i had one at one time but i got it cheap and made money on i when i sold it. they are useless and you feel nothing under 75mph, at high speeds it is worse you can feel the downforce on the rear which doesnt help traction or anything. all it did was push down and dent my trunk lid where the mounts were. people like them because it makes there car look fast but in reality i would think they would slow you down more than anything.