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Reduced turbo lag (where applicable)
For those in colder climates
AEMnet CANbus-enabled for transmitting data to EMS or data logger
the Grip Series is the more efficient purchase
Flatout Suspension GR40-PRO Coilovers - 2015-2021 Subaru STI PDM_caster-adjustment Reduced turbo lag (where applicable)Flat Out Suspension GR40 PRO Coilovers 2015 2021 Subaru STI The Flatout Suspension GR40 PRO represents the top tier of rally proven coilover systems, engineered specifically for professional rally, rallycross, and competitive motorsport applications. Built for drivers who demand uncompromising strength, adjustability, and control, the GR40 PRO provides championship level performance in the most extreme conditions. Unlike entry level kits, it features