Automatic Compression Release (ACR) valves reduce the strain of starting your high performance motor by reducing cyclinder compression - automatically! The engine is easier to turn over, resulting in less wear on your starter and battery. After start, the ACR valves close to restore full compression. ACR gives you peace of mind and protects your investment.
Fits '07-later Twin Cam-equipped models. Can be used with original stock or screamin' eagle heads
Installation requires separate purchase of model-specific ACR wiring harness
sold as a pair
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