Edelbrock's Performer/Classic IAS gas shocks for GM trucks and vans feature the patented Inertia Active System. This exclusive Edelbrock shock design switches instantly between a soft and a firm circuit for superior handling and a smooth ride. Because it has the ability to switch between circuits almost instantaneously, total control over road surface irregularities is unparalleled with no compromise in handling as in conventional shock absorber designs. Edelbrock Performer/Xtreme IAS Series Shocks - GM Trucks are sold individually.

Performer IAS Shocks	Xtreme IAS Shocks
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Performer IAS Shocks were first shocks to include the Inertia Active System. They have a distinctive red powder-coated finish.	Xtreme IAS shocks are for lifted trucks and SUVs with a durable zinc-plated finish and 5/8'' rod.
Edelbrock Application Guide