Mishimoto Racing Thermostat for Dodge Charger & Challenger HEMI 2006–2019 — 180°F opening, direct-fit upgrade

If you drive a Dodge Charger or Challenger with a HEMI between 2006 and 2019 and want more consistent engine temperatures under load, this racing thermostat is engineered as a bolt-in upgrade. Mishimoto recalibrated the opening temperature from the factory 203°F (95°C) down to 180°F (82°C), allowing coolant to flow earlier and reduce peak operating heat. Built from robust materials and digitally calibrated, the MMTS-JED-06L aims to improve thermal management without major modifications.

How does a lower-temperature thermostat affect daily driving and spirited runs?

Opening earlier lets coolant circulate sooner, cutting peak cylinder head and intake temperatures during heavy throttle or towing. That cooler baseline helps stabilise temperature swings during repeated high-load events, reducing heat soak effects. You’ll notice the benefit most during track days, long pulls, or hot-weather commuting.

• Opens at 180°F (82°C) vs factory 203°F (95°C)
• Faster coolant flow when engine heats rapidly
• Reduces repeated heat spikes during performance driving
• Helps maintain steadier operating temps on long drives

Will this thermostat work with stock and modified HEMI setups?

The MMTS-JED-06L is engineered as a direct-fit replacement for 5.7L, 6.1L, and 6.4L HEMI engines from 2006–2019, making it suitable for both stock and upgraded cars. It’s compatible with naturally aspirated, cammed, and many forced-induction applications where improved cooling is desired. Because it keeps temps lower, it pairs well with other cooling upgrades like larger radiators or high-flow water pumps.

• Fits Dodge Charger and Challenger HEMI models 2006–2019
• Works with stock engines and many modified setups
• Complements other cooling system upgrades
• Designed as a bolt-in, no-modification replacement

How reliable and accurate is the Mishimoto racing thermostat?

Mishimoto builds the MMTS-JED-06L from high-quality materials and uses digital calibration to ensure consistent opening at the rated temperature. The unit is manufactured to withstand repeated thermal cycling typical of performance driving. Its construction focuses on durability and predictable operation so it can be relied on as part of a performance cooling strategy.

• Digitally calibrated for precise opening temperature
• Constructed from durable, automotive-grade materials
• Engineered for repeated thermal cycling and performance use
• Backed by Mishimoto's quality standards

Is installation straightforward for a DIY mechanic?

The thermostat is a direct-fit replacement designed to simplify the swap with factory housings and associated gaskets. Most experienced DIYers or professional technicians can complete the install with common hand tools and basic cooling system knowledge. As with any cooling system service, draining coolant and proper torqueing of fasteners are recommended to prevent leaks.

• Direct-fit for original thermostat housing—no modification needed
• Uses OEM-style mounting and seals for leak-free fitment
• Requires coolant drain and refill; follow torque specs
• Installation time aligns with standard thermostat replacement

Who is this for: The Mishimoto MMTS-JED-06L Racing Thermostat is aimed at Charger and Challenger owners who push their HEMI-powered cars—track enthusiasts, drag racers, tow-capable drivers, and those in hot climates—who want tighter thermal control without complex modifications. It’s also a practical choice for anyone replacing a failing thermostat who wants a performance-minded upgrade that remains a simple, reliable bolt-in solution.