Mishimoto Aluminum Auxiliary Radiators MMRAD-SUP-20A – Toyota GR Supra (A90)

OVERVIEW

The A90 GR Supra has quickly become a tuning-community icon, but even with BMW engineering behind it, rising coolant temperatures can cut a track day or a canyon run short. The Mishimoto Performance Auxiliary Radiators replace the pair of slim factory side-mounted units with full-aluminum cores built to keep the B58 at its optimal operating temperature.

The stock thin core and plastic end tanks are gone, replaced by a TIG-welded, all-aluminum construction. Core thickness grows to 1.57", a 30% increase in core volume over stock, and the updated tube-and-fin design expands external fin surface area by 180% for maximum heat dissipation — particularly when paired with the Mishimoto Performance Aluminum Radiator. Strutted tubes run through the core for stability and to reduce the risk of breaks or leaks.

The auxiliary radiators are supplied as a pair in a polished finish and are covered by the Mishimoto Lifetime Warranty.

SPECS

• Direct fit for the 2020+ Toyota GR Supra 3.0L and 2018+ BMW Z4 3.0L (B58)
• Sold as a pair
• 30% increase in core volume over stock
• 180% increase in external fin surface area over stock
• 1.57" thick, efficiently brazed aluminum core, single row
• Overall dimensions per radiator: 11.7" L × 9.5" H × 2.9" W
• Full aluminum construction with durable TIG-welded end tanks
• Strutted tubes throughout the core for maximum durability
• Increased fluid capacity for improved heat dissipation
• Polished aluminum finish
• Mishimoto Lifetime Warranty

PARTS INCLUDED

• (2) Mishimoto Performance Auxiliary Radiators

TECH RESOURCES

Additional Parts Required

• None. Mishimoto specifies no additional purchased hardware for these radiators — they are a direct fit for the factory auxiliary radiator locations.
• Coolant to refill the system after installation (installer-supplied), plus a drain pan and coolant funnel.
• Optional companion: Mishimoto Performance Aluminum Radiator, Toyota GR Supra 3.0L 2020+ — Mishimoto notes the auxiliary radiators deliver their best results when run with the main performance radiator.

Installation

• Mishimoto Toyota GR Supra radiator / auxiliary radiator installation guide (PDF) (hosted by Speed Logic)

Notes

• Mishimoto officially lists MMRAD-SUP-20A for the 2020+ Toyota GR Supra 3.0L and 2018+ BMW Z4 3.0L (chassis A90 and G29). The G20 and 2.0L applications are carried over from earlier listing data — please confirm fitment with Speed Logic before ordering.

PART NUMBER

• MMRAD-SUP-20A — Performance Auxiliary Radiators, polished finish (pair)

VEHICLE APPLICATIONS