do88 Auxiliary Radiator – BMW S58 G8X M2/M3/M4

OVERVIEW

Alongside the main charge-air heat exchanger, the S58 platform uses a secondary "auxiliary" radiator in the front cooling stack — helping manage additional heat load, particularly under sustained high-load or track conditions. The do88 Auxiliary Radiator is a larger-capacity replacement for this factory component, designed to complement the do88 Front Intercooler Radiator as part of a complete cooling system upgrade.

SPECS

• Construction: Full aluminum construction with TIG-welded end tanks, matching the build quality of do88's other radiator products
• Fitment: Designed as a direct replacement for the factory auxiliary radiator, using OE mounting points
• Platform-specific: Engineered specifically for the S58 platform — not a universal or one-size-fits-all radiator

PARTS INCLUDED

• 2x do88 auxiliary radiator
• Mounting hardware

TECH RESOURCES

• Direct-fit replacement for the factory auxiliary radiator — no permanent modification required.
• Commonly installed alongside the do88 Front Intercooler Radiator (and S58 Engine Oil Cooler) for a complete front cooling system upgrade, though it functions independently as well.
  

PART NUMBER

• WC-440

VEHICLE APPLICATIONS

Note: this product is not available for the B58 platform, which does not use the same auxiliary radiator layout. Always confirm your exact chassis and engine generation before ordering.