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Mine has been pretty much become a track car but the 180 suffices for me. The heater never gets real hot but it is enough to deice the front windshield and be comfortable.
If your car is going to do a lot of street time then the 195/180 would probably be a better choice than the 160. With my temps as low as they are, I don't think it ever gets hot enough to burn off the impurities in the oil. That isn't a major concern since I change the oil about every month (once every other track session)
Changed out my 180 and went with the 160 and added the manual fan on/off switch and set the ECM at 165. Run 173-175 most of the time going to the track. In the staging lanes with the Pro Cooler intake gel pak on and the manual fans running it keeps a pretty consistent 160-165 or lower for launch.