Mishimoto MMRAD-MIA-99 Aluminum Radiator for 1999-2005 Mazda Miata Manual

Vehicle Fitment

• 1999-2005 Mazda Miata (NA/NB, RWD) with 1.8L I4 - Manual Transmission Only

Features

• Direct-fit performance aluminum radiator engineered for Mazda Miata cooling upgrades
• Full TIG-welded aluminum construction for durability and corrosion resistance
• Efficient two-row, ~2.05" thick brazed aluminum core increases thermal performance
• Increases coolant capacity and heat dissipation over many stock radiators
• Includes 1.3 Bar high-pressure radiator cap to raise coolant boiling point
• Includes magnetic drain plug to help capture metallic debris
• Designed for street, track, and autocross use with improved cooling efficiency
• Backed by Mishimoto Lifetime Warranty for long-term peace of mind

Specifications

• Material: 100% brazed aluminum
• Core Rows: 2
• Core Thickness: ~2.05"
• Overall Height: ~26.2"
• Overall Length: ~17.2"
• Overall Width: ~2.55"
• Fluid Capacity: ~1.79 gal
• Inlet/Outlet Size: ~1.25"
• Drain Plug Thread Size: M16 x 0.06
• Transmission Cooler: Not included (optional universal cooler recommended for automatics)

Included Components

• 1x Mishimoto MMRAD-MIA-99 aluminum radiator
• 1x Mishimoto 1.3 Bar high-pressure radiator cap
• 1x Magnetic drain plug
• Mishimoto Lifetime Warranty documentation

Product Description

The Mishimoto MMRAD-MIA-99 aluminum radiator is a direct-fit performance cooling upgrade designed specifically for **1999-2005 Mazda Miata (NA/NB)** models equipped with the 1.8L inline-4 engine and manual transmission. Built with a robust two-row brazed aluminum core and TIG-welded end tanks, this radiator increases coolant capacity and delivers improved heat dissipation compared to many OEM radiators, helping keep temperatures in check under spirited driving, long highway runs, or track/autocross use.

Installation is straightforward, requiring no cutting or modification - it bolts directly into factory mounting locations. The included high-pressure radiator cap raises the boiling point of the coolant for better thermal performance, and the magnetic drain plug helps trap metallic debris to protect your cooling system over time. Backed by Mishimoto's Lifetime Warranty, the MMRAD-MIA-99 is a popular cooling upgrade among Miata owners seeking reliable performance and improved temperature control.