These TCI Ultimate StreetFighter converters are completely remanufactured with furnace-brazed hand-welded fins, a cast steel stator, a hardened pre-ground front pump hub, a dual bolt pattern, and needle bearings. These converters will give you about a 4,000 to 5,000 rpm stall speed for competition-style launches. They're recommended for use on high-compression street/strip engines and higher performance cars and are used on some of the fastest street machines the world over. Some applications are also available with an anti-ballooning plate for use on nitrous oxide equipped vehicles.