Some are adjustable on compression only (when car dives downward) and some are adjustable on both compression and rebound (when car rises upwards after compression). QA1 makes the dual adjustable types too but are more expensive than single adjustable. Spending money on shocks can be one of your best investments, think about off roading, circle track, drag racing, ect... Shock tuning and shock performance makes the difference in winning or losing, especially on track cars.
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