This GPM aftermarket kit supplies internal damper components intended for HPI Savage 21 models using SAV13170A and SAV13170B assemblies. The parts are designed as RC-scale replacements and service items to allow routine rebuilds and basic tuning of the shock internals.
Compatibility is limited to the listed SAV13170A & SAV13170B configurations, check your chassis parts list before ordering. Installation typically requires disassembly of the damper, inspection of seals and pistons, and reassembly with correct damping fluid and spring preload settings to restore or alter shock response.
Use this kit when performing maintenance or when you want to adjust shock behaviour during setup sessions; it supports routine service and incremental tuning work on Savage 21 shock units.
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