I have a gear vendors in my 500 duster have had it for about 5 years now and it runs 9's. I run 4.30's and use the gear vendors as a 4th gear. Have probably 300 to 400 runs at the strip on it and works flawlessly. It is still able to drive this on the freeway. check it out at http://www.youtube.com/watch?v=ggjvw6t_6Sw