If you are like me, and making small, but effective modifications to your Civic, I highly suggest you get a Neuspeed upper strut bar. Made of ONE piece of lightweight aluminum tubing, this bar reduces flex and twist between the strut towers.TOOLS NEEDED:
A 14mm Socket and a ratchet.
Here is a photo of what the kit comes with:

It comes with the bar itself, a nut to reattach the Clutch fluid reservoir on the 01-03 models, and 4 rubber caps. Most people have not even used the 10mm nut, they just relocated the clutch fluid reservoir by pulling it forward about 2 inches on its hole.
Open the hood, and look at the driver side strut tower in the engine bay... It will look similar to this:

Notice the clutch fluid reservoir is a little close to the brake fluid reservoir, but we will take care of that shortly.
Undo the 2 OUTER MOST bolts on the shock tower and set them aside, for you to use later. Do the same for the outer 2 studs on the passenger side. Place the passenger side of the bar over the 2 oute studs and insert the stud nuts over the studs, and finger tighten them with the deep well socket you used to remove them.
Then, with a little pressure pull the clutch fluid reservoir toward the front of the car, until the bar will fit in between the brake reservoir and the fluid reservoir.
Here is the tricky part, if you make it tricky.
I found it easiest to jack up the drivers side lower lift point, and LOOSEN, not remove, but only LOOSEN the 3rd nut on the drivers side tower. Jack the car up until it allows the nut to hold up the strut. The bar will then slide down over the studs.
Then, tighten everything down, and torque the stud nuts to specs.
Then, apply a dab of silicone to the bottom of the little plastic rubber caps to prevent water getting into the studs and rusting them.
This is what your final product should look like...
The driver's side. Notice the movement of the fluid reservoir:


And if you were going to ask, YES, this bar will clear an aftermarket intake. Behold:
Sola gratiaFlickr|DeviantArt