Mishimoto
340 Thermostat
SKU: MMTS-MOP-11L
View on Mishimoto website+0.3
Pounds Added vs Stock
What You'll Need
Socket set, fresh coolant (you'll lose some), a drain pan. The thermostat housing is easily accessible on the HEMI. Watch a YouTube video first — it's very straightforward.
Great entry-level mod for any build
Compatible Vehicles
Price Comparison
Compare prices across 4 retailers — all links go to the real product page
Why Install This?
Benefits
- Easy bolt-on installation — most people can do this in their driveway with basic tools
What Does This Do?
The thermostat controls when coolant starts flowing through the radiator. Stock thermostats open at about 203°F, which is optimal for emissions and fuel economy. This Mishimoto unit opens at 160°F, meaning coolant circulates to the radiator much sooner, keeping everything cooler. Benefits: reduces engine temps by 20-40°F under load, prevents heat soak during track days or heavy traffic, cooler intake air temps mean slightly denser air charge. Essential for forced induction builds where heat management is critical. Trade-offs: the engine takes longer to reach operating temperature in cold weather, which means reduced fuel economy and more wear during warmup. Your temperature gauge will read lower than normal — this is expected, not a problem. On stock naturally-aspirated engines that aren't tracked, you may not notice any benefit.
Technical Details
Lower temperature thermostat opens at 160°F vs stock 203°F. Keeps engine temperatures lower for consistent performance. Direct OEM replacement.
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