What size wheel and tire are you running? At one time I had 18x8 225/40-18's on there and now I'm
running a 17x8 235/45-17. The extra rubber seems to suppress a lot of bump noise and vibration even
more than I expected.
Also, I like the idea someone posted earlier about running stock struts with lowering springs. I had Apexi
coilovers on the car when I bought it. They were getting to be in bad shape, didn't handle like I expected
and were just plain rough on anything but perfect roads. Since I didn't have the stock struts around, I
replaced the coilovers with a set of Tokico D-spec (6-way adjustable on rebound-damping) gas shocks
and RCE Yellow (street and track) lowering springs -25mm front -20mm rear. I also have whiteline adjustable
sway bars, ends links, bushings, etc. etc. installed.
For an even smoother ride with roughly the same performance, I'd use this setup with the RCE Black
(regular guy) lowering springs.
I really like the way the car handles AND feels now. I like being able to adjust the damping rebound which
allows me to change the car's attitude in turns, for example, tighten up the rear end more on a short auto-x
course to induce more oversteer.
The shocks have to be set evenly from side to side otherwise stability during accel/decel is horrible. It's very
easy to tweak the shocks right in your driveway though so don't worry. FAR EASIER than adjusting coilovers.