Hughes Performance Pro-IV Series race converters are available from an entirely new casing and are built differently than our other full race torque converters. These units are more aggressive, delivering a hard hit off the line and soft transition down track with no loss in top-end efficiency and mph. They run faster than any other 9 in. that Hughes has ever produced, give you consistency at 60 ft. that you won't believe, and still let you kill the tree. They also offer you a great reaction time, a more aggressive stator, and a less aggressive fin angle.