they are ceramic coated and were on my car 1 day. much deeper tone and more volume. 2&1/2 inlet. $800 picked up.
(http://i1257.photobucket.com/albums/ii510/kristopherbush/IMG_7496_zpseab70eeb.jpg)
(http://i1257.photobucket.com/albums/ii510/kristopherbush/IMG_7500_zps6b755ccf.jpg)
(http://i1257.photobucket.com/albums/ii510/kristopherbush/IMG_7501_zpsb71f9a47.jpg)
$800 picked up