CSF Auxiliary Radiator for 2021-2026 BMW M3/M4 & 2023-2026 M2 - 8321

Key Features & Specs:

• Part Number: CSF 8321
• Product Type: High-performance auxiliary radiator
• Core Design: 2-row, 42mm high-performance core
• Tube Technology: CSF exclusive B-Tube technology
• Fin Design: 5mm Track-Spec multi-louvered fins
• Core Comparison: 42mm 2-row core versus 34mm OEM 1-row core
• Tank Volume: Increased over OEM design
• Construction: 100% TIG-welded all-aluminum construction
• Tank Material: All aluminum, replacing OEM plastic tanks
• Finish: Satin black OEM+ finish
• Connections: OEM-style quick-connect inlet and outlet
• Rock Guard: Detachable rock guard included
• Installation: True drop-in fit; no modifications required
• Position: Fits either left or right side
• Quantity: Sold individually; two auxiliary radiators are required per vehicle
• Testing: Individually leak and pressure tested
• Warranty: 2-year limited warranty
• Replaces OEM Number: BMW 17118095285 / 17 11 8 095 285

Fitment:

• 2021-2026 BMW M3 3.0L Turbo
• 2021-2026 BMW M3 Competition 3.0L Turbo
• 2022-2026 BMW M3 Competition xDrive 3.0L Turbo
• 2024 BMW M3 CS 3.0L Turbo
• 2021-2026 BMW M4 3.0L Turbo
• 2021-2026 BMW M4 Competition 3.0L Turbo
• 2022-2026 BMW M4 Competition xDrive 3.0L Turbo
• 2023 BMW M4 CSL 3.0L Turbo
• 2025-2026 BMW M4 CS 3.0L Turbo
• 2023-2026 BMW M2 3.0L Turbo
• 2026 BMW M2 CS 3.0L Turbo

Upgrade auxiliary cooling capacity with the CSF 8321 High-Performance Auxiliary Radiator for BMW G8X M3, M4, and M2 applications. This satin-black, all-aluminum radiator features a larger 42mm two-row core, increased tank volume, CSF B-Tube technology, and Track-Spec multi-louvered fins to support heat dissipation during high-performance street, track, and racing use. Designed as a direct drop-in replacement, the 8321 fits either the left or right side using OEM-style quick-connect connections and includes a detachable rock guard for added protection.