A proper alignment is a good idea anytime you make major changes to your suspension. 2cents
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No bar in front needed. I think the best thing to do is leave the bar where it is for a bunch of miles. Notice all handling characteristics. *Note: the bar will not show what it is doing until it is loaded up in a corner pretty good.
Notice how it is if you have to brake in a corner, accelerate in a corner, lift off the gas. What happens when you turn in late, fast sweepers...etc. Learn the car fully with the new setup.
Then, after a while, change the setting. Repeat above and decide which is better for you. A bigger bar, or a higher setting is not automatically better or cooler. Changing the tire pressure effects things almost as much. (Check tires, start at 38 psi or something and check often).
Then you will know what the bar does, and why you like the setting you finally decide on. Starting in the middle is a good place to start.
As always my internet advice comes with a money back guaranty.