For sale new is box is a custom ATI Super Damper SK887A 624290 For a Nissan QR25DE By Vision One Racing. Item was never installed or used. Item was purchased for a 2004 nissan sentra b15 Se-r, verify fitment on your vehicle before purchasing, I am not responsible if it doesn't fit your application or engine. From Vision One Racings website "ATI Dampers are a crucial component for any performance-built engine. With the long stroke of a QR25, harmonic vibrations are no-doubt a real concern. With every power stroke of the engine, the crankshaft literally twists as it tries to rotate a resisting flywheel. This causes the damper-side of the crankshaft to snap back and forth throughout the RPM range, and is exaccerbated with more power and more RPM. These vibrations can be extremely damaging to the oil pump, timing components, bearings, accessory drive and many other items within the engine. ATI dampers are specifically 'tuned' to absorb these vibrations and keep the momentum of the crankshaft moving in one direction - effectively eliminating the 'snapping motion'."

https://www.visiononeracing.com/product-page/ati-super-damper-nissan-qr25de