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Subaru OEM High Performance Gear Oil 75W90 - 1 Quart Redline Superlight ShockProof Gear Oil 1 Quart Redline LightWeight ShockProof Gear Oil 1 Quart
This is an OEM Subaru 75W-90 Oil Improves shifting Improved cold shifting.
TiC 6MT Pivot Bushings 04-2017 STI Red Line MT90 GL-4 Gear Oil 1 Quart ( Nissan, Toyota and Mazda ) Red Line 75W90 GL-5 Gear Oil 1 Quart
They fit all years of the USDM STi. Eliminates notchy shifting, even when cold. Most popular Red Line gear oil.
Whiteline Pitch Mount Replacement for OEM Bushing 02-07 WRX / 04-07 STI FactionFab Rear Shifter Bushings 02-14 Subaru WRX, 04-20 STi Whiteline Gearbox - Mount Bushing (02 - 18 WRX / 04 - 18 STi)
Limited lifetime warranty Direct factory replacement 3 year / 60,000 mile warranty
Torque Solution Transmission Member Bushing 02-14 WRX / 04-17 STI Torque Solution Rear Differential Inserts 08-21 STI / 08-21 WRX Torque Solution Rear Differential Bushings 08-17 WRX / 08-17 STI
Installs in under 30 Minutes. Increases response Reduces rear end float under acceleration
Perrin Braided Stainless Clutch Line 15-20 WRX / 15-20 STI Whiteline Gearbox Positive Shift Bushing Kit 08-21 STI / 08-21 WRX Group N Pitch Stop Mount 02-18 WRX / 05-09 OBXT / 04-20 STI
Includes hardware Faster shift response OEM Replacement
Grimmspeed Stainless Shift Knob Torque Solution Solid 6 speed Shifter Linkage U-Joint Subaru STI 2004-2021 Perrin 6spd Short Shifter Adaptor  04-2017 STI
Made in USA Saves money! PERRIN shifter allows for a 0%-50% reduction in shifter throw.
Aluminati Solid Trans Cross Member Bushings 02-20 Subaru WRX, 04-20 STi Torque Solution Pitch Stop Mount 02-18 WRX / 04-20 STI Aluminati Solid Pitch Stop 02-20 Subaru WRX, 04-20 STi
Made in the USA
Life Time Warranty

Made in the USA
Aluminati Solid Pitch Stop Red 02-20 Subaru WRX, 04-20 STi Torque Solution Solid Billet Pitch Stop Tranny Mount - Black (15 - 18 WRX / STi) Perrin Reverse Lockout Lever 04-17 STI
Made in the USA Eliminate wheel hop Machined from billet 6061 aluminum.
Aluminati Solid Pitch Stop SE Clear 02-20 Subaru WRX, 04-20 STi Grimmspeed Pitch Stop Mount 02-21 WRX / 04-21 STI / 04-18 FXT / 05-12 LGT / 05-09 Outback FactionFab Pitch Stop Mount 2002-2020 Subaru WRX/STi
Made in the USA Direct Replacement Direct factory replacement
Perrin Pitch Stop 02-20 WRX / 05-09 LGT/ 04-20 STI Whiteline Engine - Pitch Mount (02 - 18 WRX / 04 - 18 STi) Kartboy Pitch Stop Mount 02-17 WRX / 04-17 STI
5 Year Warranty

3 year / 60,000 mile warranty Reduces engine movement