CSF BMW B58 Gen 2 (M240I/M340I/M440I/Supra) High-Performance Front Mount Heat Exchanger

The 2nd-generation B58 engine faces a genuinely well-documented problem: its liquid-cooled charge air system heat soaks rapidly with no ability to recover, driving intake air temperatures high enough that the ECU cuts power - and in severe cases, triggers limp mode. This isn't theoretical: at the 2019 Global Time Attack Finals at Buttonwillow Raceway, several heavily modified B58-powered Supras could only manage 2-3 laps before overheating, forcing drivers into cool-down laps or improvised trackside fixes like spraying water directly on their heat exchangers.

CSF's High-Performance Heat Exchanger solves this at the source. Through multiple prototypes, CSF fit the largest and most efficient cooler achievable within the OEM housing - the factory unit is a single-row core just 27mm thick, while CSF's industry-exclusive design uses the world's largest 2-row core at 68mm, built with their B-Tube technology and filling the entire available area beneath the OEM X-brace. A unique triple-pass flow design routes water through the core three times before it exits and returns to the manifold charge cooler, ensuring the lowest possible outlet temperature - a genuine advantage over both the OEM design and every other aftermarket option, which use single-pass flow. A detachable rock guard is included for protection in this exposed position.

Why Choose This Heat Exchanger

• World's largest 2-row, 68mm core - versus the OEM's single-row, 27mm design
• Unique triple-pass flow design - lowest achievable outlet water temperature, unlike single-pass OEM or competitor units
• Faster heat soak recovery - directly addresses the documented track-day overheating issue on this platform
• Fills the entire available space beneath the OEM X-brace - genuinely the largest cooler that fits
• Includes detachable rock guard - protects the core in this exposed front-mount position
• Mirror-polished finish available

Compatibility

• BMW G20 M340i (B58 Gen 2)
• BMW G22 M440i (B58 Gen 2)
• BMW G42 M240i (B58 Gen 2)
• Toyota GR Supra A90/MK5 (B58 Gen 2)