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Improved boost response
Improves the horsepower
Adjustable ride height for optimal stance and geometry
uncomfortable ride
HKS HIPERMAX-S Front Pillow Ball Full Kit - 2015-2021 Subaru WRX / STI 2015-2021 WRX Improved boost responseHKS HIPERMAX S Front Pillow Ball Full Kit 2015 2021 Subaru WRX STI HKS Hipermax Suspension Engineering The HKS Hipermax line is the product of decades of suspension development through motorsport application and real world testing. Each kit is designed for a specific platform, with spring rates, damping curves, and upper mount geometry validated through HKS's own testing program. The Dual Preload Valve System (Dual PVS) suppresses unnecessary damping
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