The BMW M5 has always redefined what a full-size performance saloon can be, and the new G90 M5 and G99 M5 Touring continue that legacy. Powered by the twin-turbocharged 4.4-litre S68 V8, these cars combine brutal acceleration with everyday refinement. M5's have also historically been a playground for tuners and the G9X platform is no different. The G9X M's S68 twin-turbo V8 responds very well to tuning with incredible power potential.
However, one limitation of the factory setup lies in the fragile OEM charge air coolers, which struggle under the extreme heat and boost generated by tuned S68 engines. CSF Radiators has addressed this with the release of their High-Performance Charge Air Coolers (CSF #8351) – engineered specifically for the 2024+ BMW G9X M5 platform.
Why Upgrade the BMW G90/G99 M5 Charge Air Coolers?
The factory charge air coolers use crimped-on plastic end tanks and glued charge pipes that can become weak points under high boost. As tuning potential rises – with S68 engines already proven to make over 900whp on stock internals – additional cooling becomes essential. The CSF solution eliminates these OEM shortcomings with 100% TIG-welded cast aluminium end tanks, integrated charge pipes, and dual 1/8 NPT ports for optional methanol or nitrous injection.
By doubling the core volume compared to stock, CSF’s upgraded coolers dramatically reduce intake air temperatures (IATs), improve reliability, and maintain consistent power delivery even in demanding conditions.
Key Features of the CSF BMW G9X M5 Charge Air Coolers
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Custom-designed liquid-to-air intercooler core, CFD tested for maximum efficiency
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~100% increase in core volume over OEM coolers
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1-piece seamless air inlet end tanks with integrated charge pipes
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Dual integrated 1/8 NPT ports for methanol/nitrous injection systems
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OEM-style “Quick Connect” water connections and sensor ports for easy installation
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3D scanned and prototype-tested for perfect fitment
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Significantly reduces intake air temperatures (IATs) under load
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Supplied in a durable crinkle black powder-coated finish (custom colours available)
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Sold as a complete set with left and right coolers plus install hardware
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Backed by CSF’s Lifetime Warranty
Real-World Performance
Extensive testing on high-power S63/S68 applications has proven CSF’s design. The new G90 and G99 kits inherit this proven engineering, with results showing consistent horsepower and torque gains even in extreme heat conditions. Tuned S68 M5s equipped with CSF coolers maintain power and resist heat soak where factory units quickly fall short – making them an essential upgrade for builds targeting 800–1000hp.
OEM vs CSF: A Clear Difference
Where BMW’s OEM coolers rely on plastic and adhesives, CSF’s cast aluminium, TIG-welded construction provides a bulletproof solution capable of handling elevated boost pressures. By integrating the charge pipe into the top end tank, CSF eliminates another weak OEM component, delivering a stronger, more efficient one-piece design.
Custom Finishes Available
Beyond performance, CSF offers a wide range of custom powder-coated and thermal rejection finishes for those who want their engine bay to stand out. Options include striking colours such as Isle of Man Green, Titan 7 Bronze, Fire Orange, Bismark Gold, Alpine White, and even heat-dispersion coatings in Space Grey or Arctic Black.
Engine Oil Cooler Upgrade – CSF #8317
CSF has also confirmed compatibility of their High-Performance Engine Oil Cooler (CSF #8317) with the G90 and G99 M5. As tuned S68 engines generate significant heat, this robust drop-in oil cooler helps keep oil temps under control, prevents limp mode, and protects against premature engine wear – particularly on cars running high boost, larger turbos, or used in hot climates.
Applications & Part Numbers
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Applications: 2025+ BMW G90 M5 & G99 M5 Touring
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OEM Part Numbers: 17 51 5 A2C 232 (right) / 17 51 5 A2C 233 (left)
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CSF Part Number: 8351
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MSRP: $2,995.00 USD / £3,120.00 GBP
Conclusion
If you’re building a four-figure horsepower BMW G9X, CSF’s High-Performance Charge Air Coolers are a must-have upgrade. They deliver proven cooling efficiency, reliability under high boost, and the strength required for the next generation of M5 tuning. With CSF’s lifetime warranty and optional custom finishes, this is the ultimate cooling upgrade with no real competition on the market.
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