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they will a lil bit, if u can shift faster and easier then u will be able to move thro the gears faster and smoother makin ur powere transfer quicker, so yea, i have heard by many the best 200bux they have spent on there car
of topic but do they really decrease your 1/4 mile time...if so by how much
They just allow for more accurate and comfortable shifts, so it will help you shift better, thus making you a better driver. It doesn't really improve your time directly, it improves it through the way you drive the car.
If you get a short throw you will notice a huge difference in how you shift and how smooth it is. But sometimes likeChrls46536 said, it does sometimes feel like it doesnt want to go into gear and can be rough. But most of the time it will just slide right into the gear.