For me the hardest part of the ls430 ul Air install was running the air lines and harness threw the car since the car is sealed so well it doesnt allow for anything to pass threw it.

 

I hear you. They definitely have the LS's sealed up tight. I ran 4 gauge power and ground wires to the trunk and used fuse blocks so that I could power everything and ground everything in the trunk. I used the rear junction block to get my accessory signal. I did the same thing on my wife's GS's. It made wiring a little easier when it's all in one place. Then I just had to run the control pads to the front.

 

Yea they sure do have the ls sealed up tight but going threw so many other build threads and audio installs i found here on the forum i found a passage way threw the deck lid and it made my life alil easier and i also used the rear junction for accessory signal and thanx god for that.