Hi,

I donīt think the CWA100 is too big. Itīs a low pressure pump with maximum flow. There is not too much pressure. Volume is the key word. Pump is used on E55 AMG`s. Same scenario here, but i wouldnīt use it with the stock radiator alone.. I like the idea of two CWA50 pumps better, because one can push and the other can suck through the radiators giving perfect conditions with minimal pump losses. The Audi CWA 50 pump has only 2 wires like the stock SRT6 pump. Almost plug n play, no big wires. I did cut the stock wires and did use the Audi pigtail.
One pump was wired to the stock location and the other to the fuse box using "add a fuse" ( heat seater terminal. 12v ignition).