Upgrading a Fairly Stock Suspension

MuuMuu101 said

Now will there be a noticeable change in handling (granted with better wheels and tires) between the Hellwig 1-1/8 bar, Firm Feel's 1-1/4 bar, and Hotchkis's 1-1/2 bar?

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Not that noticable with the level of your other upgrades. Use the rear adjustable sway bar to tune your balance.

The Hotchkis and Hellwig are hollow. That will save a few pounds.