"Necessary" - probably not for your application of bumming around town
These parts improve durability under hard driving and allow the alignment shop to correct your geometry as you lower the car
Bumpsteer describes what happens when your car . . . hits a bump. from the factory, it is designed a certain way; as you lower the car and change the geometry, that effect is changed
under dynamic driving conditions, . . yeah, you want your car to be able to behave with predictability and stability during sudden elevation changes
From a practical standpoint:
throw them on at the same time as everything else while your car is up so you only need to get one alignment
Note that this will probably increase your steering feel
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