At first I thought a stand alone heat sink style cooler would be enough, but it wasnt. I was saw 250* in traffic one day. That was when I knew I had to plumb the stock cooler in too.
I took the car out for about 30 minutes and it got to 180* and stayed there. I'm taking a 3hr road trip tomorrow and will be scanning the car the whole time to see how things go.
This is the tool I was talking about:
STAINLESS BRAIDED HOSE ASSEMBLY TOOLS from Aircraft Spruce