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Spring isolators are there to keep metal/metal contact out of the equation. You dont need them, but without them those springs may lower it more than you want. Aftermarket Isolators are more stiff and help out in the handling of the car(not much however). You can reuse the stock isolators if you want, but they will likely be cracked and dry rotted.
I have h+r springs and my Isolators were in good shape so i reused them. but as posted earlier if they are dryed out or torn then its a good Idea to replace them. its cheap insurance
I have h+r springs and my Isolators were in good shape so i reused them. but as posted earlier if they are dryed out or torn then its a good Idea to replace them. its cheap insurance
Race springs i think are on the heavy side for street use and they dont lower the car all that much. I hope anyone that is doing lowering springs for the looks does the SS's not the Race springs except for termie owners.