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Here is what you get when you get a set of coilovers, four of each (springs, adjustable perches and spring caps) as well as a set of spanner wrenches.
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With the car on level ground and the emergency brake set, start with one corner at a time. Remove the center bolt from the strut tower. This releases the strut itself and leaves the top spring cap still bolted to the car. Then slowly jack up that corner. As the weight of the wheel, hub and brake assembly pulls down on the strut, it will pull the strut out of the strut tower and release the tension on the factory spring. This is where most people use a spring compressor, but if your limited on tools, this way works just as easy if not easier. Now that the top of the strut is free from the strut tower and the tension is off the spring, remove the wheel and set the car on a jack stand.
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Remove any tie rod end or steering arms that may be attached to the strut. You also need to remove any brake like brackets.
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Now remove the bottom two bolts that mount the bottom of the strut to the hub assembly and remove the entire strut and spring assembly from the car. Remove the factory spring and all rubber bushings from the strut. Also remove the strut cap; this can be done using a flat screwdriver and a hammer.
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Here is the difference between the factory spring (right) and the coilover (left).
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