Mishimoto Aluminum Expansion Tank

2011–2023 Chrysler 300, Dodge Challenger, Dodge Charger 3.6L V6, 5.7L Hemi, 6.4L 392

Part #: MMRT-MOP-11EN

Overview

The Mishimoto Aluminum Expansion Tank is a premium replacement for the factory plastic coolant reservoir found on 2011 to 2023 Chrysler 300, Dodge Challenger, and Dodge Charger models equipped with 3.6L V6, 5.7L Hemi, or 6.4L 392 engines. Designed to endure the demands of both daily driving and aggressive performance scenarios, this expansion tank offers superior durability and reliability compared to the stock unit.

Featuring a sleek micro-wrinkle black finish, it enhances engine bay aesthetics while maintaining optimal cooling system function under high-stress conditions. This tank is an ideal upgrade for enthusiasts and daily drivers alike who want to eliminate common issues such as cracking, warping, and heat degradation associated with plastic reservoirs.

Key Features

Engineered for strength and performance, the Mishimoto Aluminum Expansion Tank includes advanced features that improve cooling system reliability and longevity:

• Direct-fit replacement for 2011–2023 Chrysler 300, Dodge Challenger, and Dodge Charger with 3.6L, 5.7L, and 6.4L engines
• Constructed from 100% TIG-welded aluminum for exceptional strength and resistance to cracking or warping
• Internal baffling retains coolant near the overflow port during aggressive driving to prevent air intrusion
• Integrated cold-fill line within the baffling maintains a clean exterior without requiring a sight glass
• Compatible with the factory expansion tank cap for straightforward installation
• Available in durable micro-wrinkle black or natural aluminum finish; natural finish suitable for custom powder coating, anodizing, or hydro dipping
• Resistant to heat degradation, ensuring reliable operation under extreme temperature fluctuations
• Backed by Mishimoto’s Lifetime Warranty for long-term peace of mind

Construction & Design

Crafted from high-grade aluminum and precision TIG welded, this expansion tank offers a fully sealed, robust reservoir that outperforms plastic stock tanks prone to cracking and deformation from heat cycling. The internal baffling system is expertly designed to keep coolant properly positioned near the overflow port, minimizing air pockets that can reduce cooling efficiency during spirited driving or track use.

The micro-wrinkle black finish not only elevates the engine bay’s appearance but also provides corrosion resistance. For enthusiasts seeking customization, the natural aluminum version serves as a blank canvas for powder coating, anodizing, or hydro dipping to match personal style preferences.

Installation & Fitment

The Mishimoto Aluminum Expansion Tank is a direct-fit replacement that installs easily using existing mounting points and hardware. It is fully compatible with the factory expansion tank cap, eliminating the need for additional parts or modifications. Installation requires only basic hand tools and can typically be completed in under an hour by most enthusiasts or professional mechanics.

This tank fits all 2011–2023 Chrysler 300, Dodge Challenger, and Dodge Charger models equipped with 3.6L V6, 5.7L Hemi, or 6.4L 392 engines, ensuring precise fitment and seamless integration with the factory cooling system.

What's Included

• Mishimoto Aluminum Expansion Tank (micro-wrinkle black or natural finish)
• Installation hardware
• Detailed installation instructions
• Mishimoto Lifetime Warranty documentation

Ideal For

This expansion tank is perfect for Chrysler and Dodge owners seeking to upgrade their cooling system’s durability and appearance. It is especially suited for enthusiasts who participate in aggressive driving, track days, or those wanting a more reliable and visually appealing alternative to the factory plastic reservoir. Whether for daily commuting or high-performance muscle car use, this tank delivers enhanced cooling performance and long-lasting peace of mind.

Mishimoto is a performance cooling brand offering aluminum radiators, intercoolers, oil coolers, hoses, and supporting hardware built to manage heat on hard-driven street and track vehicles. For boosted setups and towing/off-road rigs alike, Mishimoto upgrades are designed to increase cooling capacity and reliability where factory systems can become a limitation.