Fabtech Front Dirt Logic 2.25 Reservoir Shock Absorber - CustomDirt Logic 2. 25 Resi Shock. Dirt Logic 2. 25's are designed to replace factory shocks with a larger, more robust configuration. The 2. 25 size is what separates it from other replacement take apart shocks for a superior ride, both on and off road. Shocks are pretuned for each Fabtech suspension, accounting for larger tires, providing the finest all around damping. Features: 2. 25in OD Stainless Steel Body. 2. 0in OD Billet Aluminum Piston. 7 8in