Dual Catch Can Kit for Honda S2000 all RHD and 06-09 LHD Fluid Lock Radium Engineering - USA-RAD-20-0099-FL - FEATURES-Effectively raises the octane and increased engine performance from cleaner inlet air -Prevents oil buildup in the intake or intercooler system walls, throttle body, intake manifold, etc. -Excessive oil collection can be an indicator of a damaged engine.-Lowers hydrocarbon emissions -Capacity: 7 fluid ounces -Height (without fittings): 5 inches -Outside Diameter: 2.45 inches  S2000 CATCH CAN KITS Radium Engineering offers two independent S2000 oil catch can kits that are sold individually or together. They do NOT vent to atmosphere (VTA), thus are emissions and track legal. Closed loop systems route clean filtered air back in through the engine to be burned and to promote negative crankcase pressure for optimal performance. Furthermore, closed systems prevent unwanted oil vapors from entering into the cabin. The 20-0097-FL Crankcase Catch Can Kit runs inline with the 1/2" valve cover breather port. At low loads it experiences atmospheric pressure, but when the engine is at high load (WOT), this hose will experience vacuum and would normally be drawing unwanted crankcase vapors, unspent fuel, and oil sludge into the air filter intake pipe. If the engine is turbocharged or supercharged and you are finding oil accumulation stuck in the intercooler, this catch can is a necessity as oil will lower the thermal efficiency properties of the heat exchange process. The 20-0098-FL PCV Catch Can Kit comes with 2 mounting brackets. One bracket will be disregarded depending if the crankcase vent kit will also be used. This catch can runs inline with the 3/8" PCV (positive crankcase ventilation) valve. When the intake manifold pressure is close to or greater than atmospheric pressure, the PCV "check" valve closes and, thus, this hose experiences no flow. Conversely, the PCV hose will experience "metered" vacuum when the engine is idling, low load cruising, and decelerating. This would normally draw unwanted crankcase vapor, unspent fuel, and oil sludge into the intake manifold immediately after a high load run. Note: Because the Radium catch cans are pressure sealed, they are great for boosted applications as well so connecting to the intake manifold is permitted. For the ultimate in engine protection, Radium recommends the S2000 20-0099-FL Dual Catch Can Kit which utilizes both the "Crankcase" catch can and "PCV" catch can. Instruction PDF