These TCI Streetfighter converters are completely remanufactured with furnace-brazed fins, needle bearings, and a flame-hardened hub. Streetfighter converters will give you about a 3, 000 to 3, 500 RPM stall speed. 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. Plus, some applications are available with an anti-ballooning plate for use on vehicles equipped with nitrous oxide.