Thanks Steeda, Demon and Chitown. I was hoping for 12's but... Seriously any of you 3 use one? I didnt buy it for a HP improving mod, I bought it for its efficiency. But I did notice a slight improvement in acceleration as well as my mileage. For 40 bux I already made my money back and then some. To the rest of you, thanks for the replys. I was just curious as to what it would run. I dont plan on racing it since I have a Mustang with just a few things done to it that I race.