Tein Flexible Damping Controller Extension Tool (FLK01-AA100/200/300)

My rear shocks on my S2000 was a pain especially the drivers side.
This is a must have.
BUY IT!!!
specifically from this guys

The kit was shipped very quickly and is pretty cool. I installed these on the rear coilovers, as getting to the dampener adjustment was a major PITA!!
I had to drill a couple of small holes in the plastic bit that covers the battery and windshield wiper fluid, but it's a small price to pay in order to be able to adjust the rear coilover dampers simply by opening the trunk, rather than taking everything out of the truck, removing all of the bits, etc etc. If you have Tein coilovers in your X, highly recommend these for the rears.