KYB's are moderately nitrogen pressurized, every car I have installed them on netted and increase in ride height.
They are fantastic shocks for the money, the nitrogen back fill keeps air bubbles to a minimum and a better ride for a longer period of time is the result. The better shops will inform the customer first, and sell him-her a 4 wheel alignment at the same time (rather than come up with some story about worn springs, it needed an alignment anyway, blah, blah, blah...).
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