The CSF High-Performance Auxiliary Radiator (Part #8355) is a premium, all-aluminum cooling upgrade engineered to protect your engine from heat soak and performance degradation. Whether your vehicle is a track-driven powerhouse or an aggressively tuned street car, this auxiliary radiator ensures optimal thermal efficiency under extreme conditions.
Utilizing CSF’s innovative structural technology, this unit replaces the failure-prone factory plastic-tank radiator with a rugged, multi-fit design capable of being mounted on either the left or right side depending on your specific vehicle architecture.
- Advanced Core Design: Features a 2-row, 42mm ultra-high-efficiency core for maximum surface area cooling.
- CSF B-Tube Technology: Uses unique, structured "B-Tubes" which increase heat transfer surface area by approximately 15% compared to regular oval tubes.
- Multi-Fit Configuration: Universally designed to fit as a direct plug-and-play replacement for both the Left or Right auxiliary position (requires 2 units if replacing both sides).
- Detachable Rock Guard: Includes a removable stone/debris guard to protect the aluminum fins from track or road hazards.
- Durable Finish: Finished in a sleek, protective Satin Black coating for an OEM-plus stealth appearance.
- True Plug-and-Play: No cutting or permanent modifications required; utilizes factory quick-connect water lines and mounting points.
| Manufacturer | CSF Cooling |
|---|---|
| Part Number (SKU) | 8355 |
| Core Thickness | 42mm (2-Row) |
| Material | 100% Military-Grade Aluminum |
| Finish | Satin Black Tech Finish |
| OEM Cross-Reference | 17118625447, 17117628057, 17117600697 |
This auxiliary radiator is a direct replacement for the following BMW platforms equipped with the N55 or Gen 1 B58 engines:
- BMW M2 (F87): 2016–2018 (N55 Engine — Non-Competition)
- BMW 3 Series (F30 / F31 / F34): 2016–2019 — 340i / 340iX (B58 Gen 1)
- BMW 4 Series (F32 / F33 / F36): 2016–2020 — 440i / 440iX (B58 Gen 1)
All items are securely packaged to prevent damage to delicate cooling fins during transit. We offer fast shipping with tracking provided automatically upon dispatch. Please ensure fitment compatibility before purchasing. Returns are accepted in brand-new, uninstalled, and original packaging conditions.