SPL Parts Rear Spherical Knuckle Bushing - 2015–2026 Subaru WRX / 2015–2021 Subaru STI / 2013–2016 Scion FR-S / 2017–2026 Toyota GR86 / 2013–2021 Subaru BRZ PDM_engine-covers Each air duct is finished

Each air duct is finished with UV-resistant clear-coat paint for resistance against various environmental conditions

Resonators installed in the design

Emissions Disclaimer: This product does not require a CARB EO#

- To fit AEM X-Series Gauges you must purchase our SMY X-Series Adapters SKU = SMY-X52

SPL Parts Rear Spherical Knuckle Bushing - 2015–2026 Subaru WRX / 2015–2021 Subaru STI / 2013–2016 Scion FR-S / 2017–2026 Toyota GR86 / 2013–2021 Subaru BRZ PDM_engine-covers Each air duct is finishedThe SPL rear knuckle bushings replace the rubber factory knuckle bushing with a low friction PTFE lined spherical bearing. Replacing the OEM rubber bushing eliminates deflection under heavy acceleration and braking loads that leads to unwanted geometry changes, and prevents binding by allowing the knuckle to smoothly articulate. The reduced deflection also translates to improved driver feedback from the tire and better overall response. We use the