LS400 Aftermarket amplifier help

Hi guys im looking to update my standard system in the car at the moment

How have you routed the power cable for the amps in the boot along the car?

thanks

just take apart one side of the interior, and run the wire underneath your interior thru the firewall, then to your battery.
 
if you're not too sure to work on it and figure it out, just take it to a shop.

Should be the same as the gs. I ran my power cable threw the boot for the main engine harness. Just cut a hole in it but be careful not to spice into the engine wiring harness. Just try to cut the hole in one of the outer ripples of the boot.