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I run southside non adjustable uppers. does adjustable uppers make a real world difference at the track?
 

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just as said, depending on power levels and height etc
 

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I run southside non adjustable uppers. does adjustable uppers make a real world difference at the track?
They let you center the tires left to right, and setting pinion angle properly can take stress off the rear U-joints.

If everything is centered right they are not going to make it faster or hook better just by being adjustable.
 
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