BDS Suspension and Zone Offroad shocks and steering stabilizers do have warranty on them although not a lifetime warranty. This is because a shock absorber or steering stabilizer is considered a "Wear Item" as they are designed with seals that degrade over time.
But if a BDS or Zone shock does fail during the warranty period you need to be aware that if the chromed shaft has pitting on it from rocks or road debris the warranty will be voided because anything that causes a rough spot on the shaft WILL make the shock fail due to the damage causing the seal to fail.
Adding a set of shock boots to your order is inexpensive protection against damage to your expensive BDS Suspension or Zone Offroad shocks.