Here's my guide to installing the KW sleeves on a CBA GT-R. DBA suspension may differ slightly. Disclaimer: install at your own risk. If you are not comfortable with suspension components, consult a professional.
That aside, on to the photos!
This is the kit I purchased (used). Note that while this guide is for the KW sleeve kit, the same procedure can be used to install an updated DBA suspension, any aftermarket coilovers like JRZ, or the common swift springs.
Start by disconnecting the adjustable suspension cable while the car is still on the ground. This is what allows for Comfort/Normal/R mode on our Bilsteins. It's delicate so I would recommend wrapping the tip with tape.
Immediately you will notice that in order to disassemble the strut, you'll need a special tool to get access to the nut while letting the cable pass through. I purchased a Max Axxess socket wrench with a 17mm Max Axxess socket from Sears. It was about $20 total and well worth it. A lot of suspension nuts/bolts are 17mm on the car so it will get much use.
Note how it allows for cable pass through.
Loosen the top suspension nut (the one in the middle, not the three supporting the strut). This is 17mm. Use your fancy new tool. It's on pretty tight so you may need to extend on your jack handle to get extra leverage. If you can't get past this part, I would not continue. You may want to remove the upper intercooler hoses to give yourself more room.
Now get the car up on jack stands and remove the wheels. Do one side at a time. In actuality, there are only a few bolts to remove to get the strut out but they are torqued extremely high and depending on your exposure to rain/rust your ability to remove them will be greatly affected. There were some nuts I could not even break loose with a break bar. I highly recommend a portable impact wrench to continually apply torque and hammering motions to remove as many of the nuts as you can. Your space is limited under the wheel well too.
Here are shots of the passenger side suspension with the bolts needing to be removed.
Edited by choester, 23 March 2015 - 10:08 AM.