I have a Softail slim S equipped with a 110 engine. I tried everything to keep that engine cool, I even installed an oil cooler with a fan, which helped the oil stay a little cooler, but I have a Vance and Hines fuel pack that shows the temperature of the head, and one time I went to Manhattan and with all the traffic the head temp was at 370, and that’s when I had to shut the bike down and let it cool. So I pulled the trigger on buying the mighty mites due to the size, and let me tell you that it was the best investment I made to the bike to this day. After I took it for a spin in stop and go traffic with the fans off I let it get hot enough for the rear cylinder to shut down and act as an air pump, I pulled over and with the bike stopped and still running I turned on the fan and I was monitoring the trmperature where it went from 290F to 250F. That’s when I knew that these fans work. I’m glad I purchased them, and I’ll be recommending them to every one. – Peter S. D, Statin Island NY