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Heating and Cooling› Radiators
CSF
CSF BMW G8X M3/M4/M2 High-Performance Auxiliary Radiator - Single Radiator
SKU: C00B 8321
Easy — 1–2 hours
Overview
Designed as a true 'drop-in fit,' it requires no modifications for installation and includes a detachable rock guard. The radiator is individually leak and pressure tested to ensure quality and comes with a 2-year limited warranty. It has a satin black finish for an OEM+ look.
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Part #: 8321
Compared to the OEM G8X coolers, the CSF units are a significant upgrade. The TIG welded aluminum tanks are much larger than the OE plastic tanks offering superior strength and fluid volume. A larger 2-row 42mm core increases cooling efficiency and capacity. This high efficiency core uses CSF's Exclusive B-Tube Technology and latest 5mm fin technology, maximizing airflow and heat dissipation. These 5mm fins significantly increase the heat exchange surface area improving overall cooling efficiency and recovery while still maintaining good airflow.
CSF manufactures the most advanced and efficient auxiliary radiator in the industry for your BMW G8X M3/M4/M2. CSF uses innovative tube and fin technologies with industry-leading testing methods to maximize airflow and heat dissipation.
Vehicle Symptoms
- Engine coolant temperature rising above normal during hard driving
- Loss of power after repeated high-speed runs
- Heat soak causing delayed restart after track sessions
- Coolant boiling or overflow after spirited driving
- Dashboard temperature gauge climbing into red zone
Diagnostic Codes
- P0217 – Engine Coolant Overtemperature Condition
Relevant Conversations
- BMW M4 overheating on track – which auxiliary radiator to buy?
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- Best cooling upgrade for HPDE BMW M3
- BMW G82 M4 high coolant temp after 20 min session
- Auxiliary radiator upgrade for supercharged BMW S58
- CSF B-Tube radiator review BMW M3 forum
- Co-purchase: CSF radiator + low temp thermostat for track
- BMW M4 coolant boiling after hard braking – radiator upgrade?
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | CSF |
| Part Number | C00B 8321 |
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About MOTORMIA
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Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.
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