Originally Posted by KamiSpeed

Depending on what your plan with the car is where you start.

If you get the Swift + Koni combo the drop is the drop you are going to have. No adjusting. So if you get the new Rays and put them on and dont like the way your drop looks with them, there is nothing you can do.

If you went with the BC Racing coilovers you will have the pleasure of dropping your car to any desired height that you want. Though the ride will be a little more harsh than the Swift Koni combo. Since the shocks are valved differently. So you will give up a little comfort but will have the car the way you want it. Now if you add Swift coilover springs to the BC coilover it will be more comfortable. You could go that route, but makes the coiloves $320 more.

Also when you drop the Z you will need at the very least SPC camber bolts in the rear to correct the camber. If you are looking to go lower than 1 inch, I would suggest SPL rear camber links. Best on the market.

If you want flush, yes 20mm and 25mm. Looks the best IMO.

Let me know if you have any other questions, im here to help!