Mishimoto RS/ST Expansion Tank

The Mishimoto RS/ST expansion tank is a TIG-welded aluminum replacement for the factory plastic coolant expansion tank, built to improve durability and provide cleaner engine bay presentation. Internal baffling helps control coolant movement during cornering, braking, and acceleration, and is designed to reduce the chance of coolant starvation from the engine’s overflow ports.

Key Features

• Durable TIG-welded aluminum construction for long-term reliability versus aging plastic tanks
• Internal baffles to reduce coolant sloshing under high-speed cornering, braking, and acceleration
• Sight tube for quick hot/cold coolant level checks
• Reuses the stock expansion tank cap
• Overflow nipple on the fill neck for adding an additional coolant tank to keep Focus RS NHRA legal
• Finish options: Black, Wrinkle Red, Wrinkle Nitrous Blue
• Engineered for fitment with installation possible in under one hour
• Mishimoto Lifetime Warranty

Fitment