Fits 99-06 Twin Cam models (excep 06 Dyna) Help to reduce oil carryover during high rpm operation; higher volume helps reduce engine and oil temperatures 53mm diameter rotors for maximum performance Gain of 20% oil pressure, 125% pressure volume and 135% scavenge volume over OEM stock TC88 oil pumps Gain of 16% oil pressure, 66% pressure volume and 100% scavenge volume over OEM stock TC96 oil pumps High-quality die-cast aluminum body construction, high-strength steel gear construction Fit both stock and aftermarket cam support plates for seamless installation.