CSF 8331 Heat-Exchanger & Trans-Cooler Module for 20-25 BMW X3 M / X4 M (S58)

Vehicle Fitment

• 2020-2024 BMW X3 M (F97) - S58 3.0 L twin-turbo
• 2020-2025 BMW X4 M (F98) - S58 3.0 L twin-turbo

Features

• Dual-function module: combines a high-performance heat exchanger with a transmission oil cooler
• 2-row, 42 mm B-tube core to maximize cooling efficiency
• 6.5 mm tall multi-louvered fins for high surface-area heat transfer
• All-aluminum, TIG-welded construction for strength and reliability
• CNC-machined mounting brackets for a secure, precise OEM-like fit
• Integrated metal rock guard to protect the core from debris
• Dual-pass transmission cooler for significantly increased cooler capacity
• OEM-style quick-connect inlet / outlet for easy installation
• Individually pressure- and leak-tested for quality assurance
• 2-year limited warranty from CSF

Specifications

• Part Number: 8331
• Heat Exchanger Core: 2 Rows, 42 mm, B-Tube
• Transmission Cooler: Dual-core, dual-pass
• Material: 100% Aluminum (core + tanks)
• Flow Style: Cross-flow heat exchanger, back-to-front pass for trans cooler

Included Components

• 1x CSF 8331 Cooling Module (Heat Exchanger + Transmission Cooler)
• Mounting brackets and tabs (CNC-machined)
• Installation guide and specification sheet

Product Description

The CSF 8331 is a high-performance front-mounted cooling module designed for the BMW X3 M (F97) and X4 M (F98) equipped with the S58 3.0L twin-turbo engine. This unit integrates both a large heat exchanger and a transmission oil cooler into a single compact module, addressing cooling needs for both charge-air and transmission systems in high-output applications.

Its 2-row 42 mm B-tube core and tall multi-louver fins provide superior thermal capacity compared to the factory units, helping to reduce intake temperatures and improve heat soak recovery. The integrated dual-pass transmission cooler significantly increases oil cooling surface area, which is especially beneficial during spirited driving or towing.

Built from TIG-welded aluminum with CNC-machined brackets, the 8331 installs cleanly with OEM quick-connect fittings and includes a rock guard for front-end protection. It's pressure-tested for reliability and backed by a 2-year limited warranty - making it an excellent upgrade for performance-focused X3M/X4M owners looking for improved thermal management.