CSF High-Performance Auxiliary Radiator – BMW M2 / M3 / M4 (G8X) #8321

OVERVIEW

The CSF #8321 High-Performance Auxiliary Radiator is a substantially stronger part than the OEM auxiliary radiators it replaces. TIG-welded aluminum tanks take the place of the factory plastic tanks, giving greater strength and holding more fluid, and the core steps up from the OEM's single 34mm row to a 2-row 42mm design featuring CSF's exclusive B-tube technology. Ultra-efficient 5mm tall multi-louvered fins increase surface area contact for more effective heat rejection and improved airflow.

Construction is 100% aluminum throughout, which guarantees both performance and long-term durability, and the mounting pins and brackets are far tougher and longer-lasting than the OEM plastic pod mounting system. The unit is multi-fit, working on both the left and right sides of the car, and includes a detachable bolt-on rock guard to protect the core. Every unit is individually leak and pressure tested. The satin black finish adds protection and gives a clean OEM+ appearance behind the grilles of your G8X.

SPECS

• 2-row, 42mm high-performance core featuring CSF's exclusive B-tube technology (OEM: 1-row, 34mm)
• Ultra-efficient 5mm tall multi-louvered fins for maximum surface area contact
• Increased tank volume and core size over OEM
• 100% all-aluminum TIG-welded construction (OEM: plastic tanks, crimp-on gasket)
• OEM-style "quick connect" inlet and outlet
• Multi-fit — fits both left and right side
• Includes detachable bolt-on rock guard
• Individually leak and pressure tested
• True "drop-in fit" — requires no modifications to install
• Satin black finish for an OEM+ look
• Suitable for professional racing, street performance or OEM replacement
• OEM cross-reference: BMW 17 11 8 095 285
• 2-year limited warranty

PARTS INCLUDED

• One CSF #8321 high-performance auxiliary radiator
• Detachable bolt-on rock guard
• Mounting pins and brackets

TECH RESOURCES

Additional Parts Required

• A second CSF #8321. The radiator is sold individually and every application requires two — order quantity 2 for a complete installation.
• Coolant for refilling and bleeding the cooling system after installation (installer supplied).
• No other additional hardware is required. CSF specifies a true drop-in fit using the OEM quick-connect lines and mounting locations.

Installation

• CSF does not publish a downloadable installation PDF for this part. Printed installation instructions are supplied in the box.
• Installation requires no modification to the vehicle; the radiator is multi-fit and mounts on either side using the supplied pins and brackets.

Notes

• Sold individually — all applications require two auxiliary radiators.
• Year ranges follow CSF's current published application table for #8321, which lists the G87 M2 from 2023 (the previous store copy said 2022+). Both 6MT and ZF8 automatic cars are covered. CSF lists the M3 and M4 as "G8X", expanded here into the individual G80/G81 and G82/G83 body codes; the G81 M3 Touring is not sold in North America. Confirm fitment for your specific chassis with Speed Logic before ordering.

PART NUMBER

• 8321 — CSF BMW G8X M3/M4/M2 High-Performance Auxiliary Radiator (satin black)

VEHICLE APPLICATIONS