Radium Dual PCV/Crankcase Fluid Lock Catch Can Kit - Honda S2000 AP1/AP2 99-09An oil catch can is essential on a performance vehicle to protect the engine from elevated levels of crankcase blow by accumulated from aggressive driving. Excess oil saturated air circulating back into the air intake stream can lead to degraded performance. Radium Engineering catch cans feature large 10AN ORB ports, a 4AN ORB drain port, 2 step oil separation baffling, and an O ring sealed dipstick. Radium Engineering offers two independent S2000 oil