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Firestone Coil‑Rite rear air helper spring kit for Toyota Sienna (2004–2017) fits inside existing coil springs to create a variable spring rate, letting you tune ride height and stiffness by adjusting air pressure. Durable polyurethane springs support 500–1,000 lbs per set and operate across a wide temperature range. Kit includes supports, hardware, air line and inflation valves with no drilling required to help level the vehicle and reduce tire wear.
Firestone Coil-Rite Air Helper Spring Kit Rear 04-17 Toyota Sienna (W237604155)
