Hey there broken89
Glad to hear you have bought the Physx card, once you have tested a couple of game let us know your conclusion.
In regards to your cooling system :o
I have never seen or used a water based cooling system but I assume you will need to bleed the system first and then add the additional parts/tubes to connect to your graphics card.
Take a look at these sites, see if you get any ideas from them.
If you know which koolance system you are running then download the manual from here and see if they have information in it:
Alternatively you could always contact Koolance at the below address and ask them for their opinion: