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K Series Upper Coolant Housing Built In Filler Hose K20 K24A1 Honda Acura Rsx Si Description: Applications: K20A, K20A2, K20A3, K20Z1, K24A1 cylinder heads. Note: Does not fit with PRB manifold and throttle bodies with cruise control. We've taken input from guys running big turbo setups on this one. The integrated filler now clears up more room for big turbo setups. The filler neck comes off the top of the housing and can be used to relocate the radiator cap to a higher point on the engine itsel...

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