RRD/GDM Extreme Race Harmonic Damper Kit - M50/S50/M52/S52/M54Proven race damper kit configured for the M5X Engine, designed to be the lightest and strongest race hub damper kit we can make for the M5X engines: Heat treated 4140 Hub with correct interference fit ARP 8740 and Grade 12. 9 hardware 4140 high strength, 60 2 trigger wheel front mountt crank signal option 6061 black anodized aluminum serpentine pulley We have redesigned and made improvements to both the trigger wheel and the hub. Designed to be
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