Hey i recently purchased carbon fiber fender strakes on ebay and they did not come with instructions i am not sure how to install them and there are 2 that are bigger than the other 2 so i do not know which ones go on the top or the bottom thank you

http://www.rx8club.com/showthread.php?t=17373
I think that should help :)
Didn't read it all but I think you're suppose to remove the black vent part and put the strakes on. I'm not sure.

thanks a lot that helped me so much:)