I want to install a small sub in the boot of my IS200, something small that doesn't take us space (like this maybe http://caraudiosecurity.com/shop/product/products_id/12524.html)
I've done my own install before so I kind of know what I'm doing but I want to find out where I can route the power cable from the battery, through the interior and into the boot? Is there a grommet or something I can pass the cable through into the engine bay? I don't want to go ripping the dash out looking for a place so if someone can give me some advice I would appreciate it.

look down the side of the battery theirs a grommit you can use it pops out behind the dash then at the rear their is a small gap so you can pass the wires through to the rear...
hope that helps..

Thanks. Where does it exit on the inside of the dash? Behind the glovebox?

yip behind the glove box

There is a similar grommet on the GS by the battery, I used a metal coat hanger to help thread and pull the power cable through when I did the exact same job.

Thanks guys.