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For 2WD only; This product complies with safety standards, but please note that the inspection personnel judgment is prioritized. ● The spring constants on the torsion bar can vary depending on year, model, grade, installed engine, and body size. Measure the spring diameter that is already attached to your vehicle and then select the right size torsion bar for your intended use. When installing on low down vehicles, please be sure to use with "REVERMP STOPPER" or "REVERMP STOPPER PRO"