do88 S58 Auxiliary Radiator BMW G8X M2 M3 M4
Product Description
Strengthen Your Cooling System with the do88 Auxiliary Radiator
Tuned G8X M-cars generate serious heat — especially during track use. The factory auxiliary radiators with their slim cores and plastic end tanks simply can’t keep up. Enter do88’s all-aluminium performance upgrade: a direct-fit solution designed to boost cooling capacity, eliminate heat soak, and withstand the demands of high-performance driving.
Why Upgrade?
A Common Bottleneck in S58 Cooling Systems
The S58 engine is equipped with a three-radiator setup — one main central radiator and two smaller auxiliary radiators in the corners. These auxiliary radiators are critical for helping maintain coolant temps under sustained load. Unfortunately, the factory units are built with narrow cores and plastic end tanks, which become a weak point on tuned or hard-driven vehicles.
Bigger, Stronger, Cooler
do88’s auxiliary radiators are not just stronger — they’re larger and more efficient. With a 43% increase in core volume and a 13% increase in frontal cooling area, these TIG-welded aluminium upgrades help prevent heat soak and maintain stable coolant temps under pressure.
Key Features
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43% larger core volume vs. OEM
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Dual-row 48mm thick core
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13% larger active cooling area
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All-aluminium construction with TIG-welded end tanks
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OE-style quick connect fittings for easy installation
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CNC-machined mounting points
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Compatible with factory rock guards
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Direct-fit for both left and right sides
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Sold individually (one per side)
Compatibility
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BMW G87 M2 (2023–202X)
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BMW G80 M3 / M3 Competition / M3 CS (2020–202X)
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BMW G82 / G83 M4 / M4 Competition / M4 CSL (2020–202X)
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For S58 engine cars only
Note: Sold individually – two required per car.
Supporting Upgrades Recommended
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do88 Front Intercooler Radiator
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do88 Inlet Manifold & Integrated Intercooler
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do88 Charge Pipes
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Upgraded coolant hoses
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Motorsport-grade coolant fluid
Why Choose do88?
Swedish-engineered and CFD-tested, do88 products are built with serious motorsport in mind. Whether you're daily driving or chasing lap times, these radiators offer proven reliability and performance where it counts.
Shipping & Delivery
Dispatch Times
Most stocked items dispatch within 1–2 business days. Some products may have longer lead times due to special ordering, availability, or build times. If your order contains multiple items, they may be shipped together once all items are ready unless otherwise agreed.
UK & International Shipping
We ship worldwide. Transit times vary depending on destination and courier. Tracking details are provided once your order is dispatched.
Import Duties & International Orders
International customers are responsible for all import duties, taxes, and clearance fees. These are not included in our prices and are outside of our control. Refusal or non-payment of import charges may result in return shipping, handling fees, and customs charges being deducted from any refund.
Damaged Shipments
If your parcel arrives visibly damaged, please refuse delivery or note the damage with the courier. If damage is discovered after opening, contact us immediately with photos. Do not install damaged items, as installation voids courier claims and return eligibility.
Returns
Returns must be authorised before sending anything back. Returns must be requested within 14 days of delivery and returned within 14 days of approval, in unused/uninstalled condition and in original packaging. Some items, including special-order, built-to-order, used, installed, or modified parts, are non-returnable.
Full details are available in our Shipping Policy and Returns & Refund Policy.
Warranty & Disclaimer
Warranty
Most products include a manufacturer’s warranty covering manufacturing defects only. Warranties do not cover wear and tear, improper installation, misuse or neglect, track use, competition or racing environments, labour costs, vehicle damage, downtime, or consequential loss. Warranty outcomes are determined by the manufacturer, not Clubsport Garage. Items must be returned for inspection at the customer’s cost unless agreed otherwise.
Fitment & Installation
Many products are aftermarket components and may require professional installation or minor adjustment. Perfect OEM-level fitment cannot be guaranteed. Professional installation by an experienced workshop is strongly recommended. Installed or used items cannot be returned.
Motorsport Use Disclaimer
Some products are intended for off-road, track, or motorsport use only and may not be legal for road use, for example non-TÜV/DOT-approved parts. It is the customer’s responsibility to ensure compliance with local laws, insurance requirements, and vehicle regulations. By purchasing and installing aftermarket parts, you accept all responsibility for ensuring compatibility, legal compliance, proper installation, and any resulting wear, damage, or failure.
Product Images & Descriptions
Product photos are illustrative and may differ slightly from the item supplied. If specific details are important, please contact us before purchasing.
Full details are available in our Terms of Service and related policy pages.
