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CSF Auxiliary Radiators w/ Rock Guards BMW F87 M2 Competition / F80 M3 / F82 M4

SKU: CSF8258
Sale price
$449.00
Regular price
$479.00
You save
6%
Currently Backordered - You can still place your order and we'll ship your order as soon as the product is back in stock!

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Installation Services

Don’t worry about the hassle — let our expert team at Forza Motorworks handle the installation for you. Our professional installation ensures everything fits and operates exactly as intended, giving you clean, factory-quality results, proper wiring or mounting, and avoiding the risks of DIY mistakes. You’ll save time, avoid frustration, and get peace of mind knowing the job is done right the first time. Contact us to learn about our installation services and enjoy a seamless upgrade from day one.

FAQ

Shipping Information
For items that are in stock, purchases made after 9am EST will be usually be shipped out in the next 1-2 business days. Please inquire to confirm lead times if you have specific time constraints. Orders will be sent via signature required at our discretion unless otherwise requested.

International Shipping
Any and all customs duties, taxes, import fees, and/or tariffs assessed in connection with the purchase shall be the sole responsibility of the customer/end user.

Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unused and in its original packaging. All returns are subject to a restocking fee based on item and package condition. Buyer is responsible for paying for return shipping costs. If you need a return label, we will email you a return label and deduct cost from refund. Original shipping costs are not refundable. Special order items are not eligible for return.

Cancellation Policy
In order to cancel your order you must email within 24 hours of placing your order or before your order has shipped, whichever occurs first. Special order items are not eligible for cancelation.

Exchange Policy
We have a 30-day exchange policy, which means you have 30 days after receiving your item to request an exchange. To be eligible for an exchange, your item must be brand new in box. Buyer is responsible for paying all shipping costs to exchange product.

Product Description

The CSF High-Performance Auxiliary Radiator (#8258) is a premium cooling upgrade designed to replace the restrictive and aging factory auxiliary radiators on BMW F8X M3, M4, and M2 Competition models. As vehicles age and power levels increase — especially during track or spirited driving — stock coolers can struggle to maintain optimal fluid temperatures. CSF’s auxiliary radiator addresses this with a larger, high-efficiency core and stronger construction that boosts heat dissipation and helps delay heat soak, improving thermal stability under load. Its drop-in design, robust aluminum build, and integrated rock guard make it both a performance upgrade and a long-term reliability solution.

Fitment Notes

  • Designed for BMW F8X M3 (2015–2018) — including CS & Competition variants.

  • Fits BMW F8X M4 (2015–2020) — including CS, GTS, and Competition models.

  • Compatible with BMW M2 Competition (F87, 2019–2021).

  • Sold individually — most applications require two radiators (one for each side).

  • Drop-in fit: mounts in factory locations using OEM quick-connect inlet/outlet fittings — no modifications required.

Included

  • CSF High-Performance auxiliary radiator with 2-row core.

  • Detachable rock guard for front-end debris protection.

  • Factory-compatible mounting hardware.

  • Installation instructions.

Product Specs

  • Core Size Increase: ~7% larger core size vs. OEM.

  • Tank Volume Increase: ~10% more volume for improved cooling capacity.

  • Core Design: 2-row, 42 mm high-performance core with CSF’s B-Tube Technology.

  • Fin Design: Ultra-efficient multi-louvered fins (6.5 mm) maximize airflow and surface area contact.

  • Construction: 100% TIG-welded aluminum for durability and thermal efficiency.

  • Finish: Satin black for OEM+ appearance behind front grilles.

  • Warranty: 2-year limited warranty from CSF.

Product Features

  • Significant cooling increase vs. stock: Larger core and tank improve cooling efficiency, reducing heat soak during aggressive driving or track use.

  • Modular multi-fit design: Each radiator fits either left or right side, simplifying spares and inventory.

  • OEM-style quick-connects: Uses factory mounting points and fittings for straightforward installation.

  • Durable all-aluminum construction: TIG-welded design eliminates plastic pod weakness and enhances long-term reliability.

  • Integrated rock guard: Protects the core from road debris damage — a common failure point on high-performance driving routes.

  • Professional racing and street performance ready: Ideal for boosted performance builds, tuned engines, and extended high-load driving.