Mishimoto Performance Auxiliary Radiators - BMW G8X M2/M3/M4

OVERVIEW

The G8X's small factory side-mounted auxiliary radiators are a known heat-soak limitation once the S58 is pushed on track or in hot climates. Mishimoto's direct-fit Performance Auxiliary Radiators replace both units with a 25% larger core for meaningfully improved heat transfer and additional coolant capacity, helping keep intake and coolant temps in check under sustained load — with no cutting or modification required.

SPECS

• 25% increase in core volume over stock for improved heat transfer
• Full-aluminum construction with TIG-welded end tanks
• Strutted tubes for added vibration and impact resistance
• Increased fluid capacity — 0.32 gallons per radiator
• Core dimensions: 11.09" L × 7.48" H × 1.65" thick
• Sold as a pair (left and right)
• Mishimoto Lifetime Warranty

PARTS INCLUDED

• 2x Mishimoto performance auxiliary radiators (left and right)
• Mishimoto Lifetime Warranty

TECH RESOURCES

• Recommended add-on: Mishimoto Auxiliary Radiator Rock Guards — steel stone guards that protect these radiators from road debris
• Direct-fit — no cutting or modification required; professional installation recommended
• Rounds out your G8X cooling alongside our Performance Oil Cooler and Charge Air Cooler Manifold
• Install video: 2021+ BMW G8X M3/M4 Auxiliary Radiators Install Guide (Mishimoto)

PART NUMBER

• MMRAD-G80-21A

VEHICLE APPLICATIONS