I have Airlift bags, which I believe are the same as the Firestones. I run 5 psi unloaded and I don't believe the ride is any different than before I installed them. This topic has been discussed on other forums. Usually, about 50 percent say the unloaded ride is stiffer and half say no change. I guess it would be easier to detect if you could compare before and after side-by-side. Everybody agrees the loaded ride is better.
Ken
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