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With one of these low-temperature JET Powertech thermostats, you get consistent engine cooling and increased horsepower by reducing engine temperature. You also get more precise metering of water throughout your engine, and since they're made from stainless steel, long life as well.
An Challenger SRT owner recommended I replace the OEM thermostat with a JET 10183. What a difference it made. My 5.7L Challenger R/T runs cooler and I've seen better mileage out of it. How about 29mpg on a 1,000 mile trip? Yes, it helped greatly.