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The COMP Cams XFI Xtreme Energy-R XEr273HR cam employs XE-R lobe designs for high-RPM street/strip performance. The description notes that custom tuning is required to optimize the cam’s characteristics. It’s aimed at enthusiasts who plan to tune engine management to match aggressive lobe profiles and who want a cam that extends top-end capability with XE-R performance characteristics.
COMP Cams Camshaft LS1 XEr273HR-14
