Just put in a new set of coilovers. http://www.hi-impact.org/ryang/modify/rx8_shock_front/rx8_shock_front.html has the full write-up. You can see all my other DIYs at http://www.hi-impact.org/ryang/modify/modify.html. PM me with any additional questions, feedback or suggestions you might have to make these DIYs better.
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Nice writeup.

One note:

If you're installing lowering springs, you should not tighten the upper control arm bolts, but instead lower the car first, and then crank the wheel all the way to one side, then tighten up the bolts that are in reach, then crank the wheel all the way to the other side and tighten the rest. Otherwise, the car sits too high.

At least that was my experience installing Tein S-tech springs.

And one question:

You know the top end of the spring sits in a little "worn-in" rubber recess? When we installed Tein S-tech springs on a friend's car, we noticed that when we used the "stock" recess, the triangular top bracket (w/ the bolts) was now turned 1/3rd away from the original orientation (that is, the side that used to face to the side of the car was now facing to the front and to the inside). Now, it seemed like the bolts all lined up and the bracket is symmetrical, but just in case, we rotated the metal bracket to the original orientation, which meant that the spring would now wear in a new rubber recess in the rubber piece (and would not be using the recess that was previously worn in).

It seems like it's a wash one way or the other, what are your thoughts on this?

as long as the bottom of the seat spring is in the right spot, the upper one doesn't matter. the length of the lowering spring is short to that of the stock one. therefore the recess above will never line up.

If you're installing lowering springs, you should not tighten the upper control arm bolts, but instead lower the car first, and then crank the wheel all the way to one side, then tighten up the bolts that are in reach, then crank the wheel all the way to the other side and tighten the rest. Otherwise, the car sits too high.Thanks for the tip. I'll add that to the DIY.
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