This stuff is not for the faint of heart, but if you dyno,race,pull sleds or just want to show your ass on the street Cenpeco makes two different race additives. Outlaw and Pullers additive. They don't like water, make sure your fuel is clean. The cetane is so high with extended use you injectors will clog.and at $60 a gallon its not cheap. Now the positive side, It will cut your smoke by 75%. And you will feel the boost in power. But like I said its not for everyone,use at your own risk.