The energy that is generated by that escapes as a repulsive force, which can disturb the vehicle's behavior. Furthermore, repeated full strokes can damage the damper. TWIN-TUBE SYSTEM: Compared to the regular mono-tube system, twin-tube attains longer strokes with a smaller repulsive force, resulting in high ride comfort.EnduraPro PLUS features 16-level damping force adjustment, for simultaneous adjustment of compression and rebound. Factory Sealed - Brand new in box. Misc Notes 1: Tein 08-10 Subaru WRX 2.5L EnduraPro Plus Rear Shock. KarParts360 is a national company with warehouses in 4 different states: New Jersey, California, Georgia, and Illinois. We only sell BRAND NEW items. Feel free to reach out to us if you have any issues or concerns regarding your order. All carrier-related damage or loss claims must be made with the carrier within 48 hours of item receipt. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Steering & Suspension\Shocks, Struts & Assemblies". The seller is "carlights360" and is located in this country: US. This item can be shipped to North, South, or Latin America, Japan.