replied to this before in the GS room, and posted pics of what does what etc.
http://www.lexusownersclub.co.uk/forum/ind...showtopic=52551
as far as im aware nobody makes a decent harness...
Which is why i had to adapt and make my own..
As stated you need two toyota iso kits... and a reel of suitable wire from maplins.. (about £25 total)
About two hours and you can run it all off a new headunit..
i am currently running my sub directly off one chanel of my sterio *sounds good too*