Today's engines are built to run hotter for reasons unrelated to performance! If you run it hot, performance goes downhill. Stock cooling fans are set to activate at 215F, too hot for high performance use. To combat high operating temperatures, SLP Performance Parts developed an easy to install Fan Control Switch. This switch allows you to turn your car's electric coolant fans on manually, yet still retain stock fan operation. So, if you are sitting in traffic or at the track waiting in the staging lanes between rounds, you can click on your fans early to keep your engine operating efficiently and producing as much power as possible.