Subaru Impreza STI Mainshaft Washer is a washer that spaces rotating transmission parts to give you smoother shifts and stronger torque delivery. The Mainshaft Washer is a small, hardened spacer ring situated between gear and bearing. It is designed to the fundamental Subaru philosophy. Furthermore, it provides ideal end play, allowing synchronizers to perfectly match the shaft speed instantly. Consequently, the result cuts grind and extends the life of the gearbox. A smooth surface finish helps each Mainshaft Washer withstand the rigors of constant spin. The intake of heat and metal on metal contact is managed so that the crisp engagement that STI owners love is not affected. The Mainshaft Washer is built to the factory specifications set by Subaru. This allows it to be compatible with every six-speed generation. So whether the car is an early road-going rally replica or the later 324 PS flagship, the Mainshaft Washer simply drops into place. There is no need for modifications and it will keep weight balanced while ensuring high efficiency. By holding the mainshaft in perfect alignment, the Mainshaft Washer also protects first gear leverage during hard launches. It then allows quiet cruising in overdrive, boosting performance while cutting down cabin noise. Many drivers have faith in Subaru's Mainshaft Washer because it can stop the gear from popping out under load. Components like this washer contribute to the lasting reliability of Subaru. Subaru enthusiasts value the compatibility of the Mainshaft Washer with the AWD system in its ability to deliver power smoothly. The Impreza STI's reputation stems from rigorous testing on both track and street, and its Mainshaft Washer helps deliver reliable power during fast shifts. The Impreza STI has low driveline losses whether you are carving back roads or lining up at autocross. The featherlight design of the part adds minimal rotating mass while the tempered steel aids in withstanding stress at high RPMs. This helps the Impreza STI maintain its famed durability. This high level of attention to detail ensures Subaru cars are ready for the next sprint. The makers make every Impreza STI responsive mile after mile.
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