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The Eibach Pro-Kits are progressive springs, like most 3rd party springs that fit the stock perch. If you want to do any racing, then you will want linear springs, and Ground Controls will be far superior to the Eibach Pro-Kits. The springs that Ground Control sell with their kits are actually Eibachs, although they are the standard 2.5 inch diameter springs. They are linear and you can pick your spring rates, and change them whenever you need to with different rates. You don't have to cut your stock spring perches to install them.
John
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