Started removing my twins this past weekend, word of advice for anyone looking at removing them.
Take both stock turbos off at the same time. I found the best way to do it was by removing the nuts circled in blue, once you have those nuts off remove the stock turbos and you can remove the nuts circled in red. (4th blue circle nearest to the rad should be red not blue)
Underneath the car nearest to the front of car
Underneath the car nearest to firewall
just to double check, the hose circled in the picture below can be blocked off. and where do people normally run the hose from the water pump (second picture)?