Eibach Sway Bar Settings

OptionZero

we can measure effectiveness by examining laptimes (Big picture) and tire wear (small picture)

In general, the experience of track folks is to add front bar to reduce understeer because the Z34 is too soft in front. Most found rear bar unnecessary

However, everyone's setup (including tires and other suspension parts) and driving style is different.

Test on your own, go with what works.

That's advice for driving closer to the limit. For bumming around on the street, you won't feel the difference.

I suggest digging through this:
Track Day Chat

and searching in the track subforum

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