Ive trying to find this answer but cant find it. If there is a thread already about this please send me the link for it and ignore this thread.
My questuon is what exactly needs to be done to the 3sgte harness to work properly in our celicas? I know iy needs to be extended because of the ecu location but what else? And who does this?? Dr.twek for about $5-600? Does anyone else does it?

yes another member does wiring, if you had searched, its posted all over this forum. his name is MR220V i think

Mr220v does harness too
He has my v6 harness right now
It costing me 430 shipped there an back
An he can make it 100% plug an play too i do beleave

Great info!