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In the 2018 Subaru WRX, the shift knob has a thread size specified in the factory manual as m12x1.25. Shift knobs play a crucial role in achieving smoother gear shifts, making it easier to switch gears and enhancing the overall driving experience. The weight and mass of a shift knob help dampen vibrations, leading to a more comfortable and smoother shifting process. The use of weighted shift knobs should not cause any damage to the car's transmission, just as resting your hand on the gearshift does not harm it.
The factory specifications for the thread size of the shift knob on a 2018 Subaru WRX are designated as M12x1.25.