Wagner Tuning Competition Low Temp Radiator (LTR) / Chargecooler Heat Exchanger OPF/GPF (FMHE) – BMW B58 Gen2 B58C G20/G21 M340i/M340i xDrive, G29 Z4 M40i, Toyota GR Supra A90 MK5 3.0 – Intercooler Auxiliary Radiator Upgrade – Part 400001011

High-capacity low temperature heat exchanger for B58C OPF platforms

Unlock consistent performance and combat heat soak with the Wagner Tuning low temperature radiator for OPF-equipped B58C models. This upgraded water-to-air charge air cooling radiator increases coolant capacity and heat rejection, stabilising intake temperatures on spirited road drives and during track sessions. Ideal for remapped and standard vehicles alike.

• Race-bred core design with an optimised inner to outer surface ratio for outstanding thermal efficiency and minimal pressure drop
• Approx. 117 percent increase in water volume versus the factory auxiliary cooler for stronger temperature control under repeated pulls
• Durable, heat-conductive anti corrosion coating for long service life in all weather conditions
• Direct-fit installation in the OE position using factory mounting points and connections - instructions included
• Engineered specifically for B58C vehicles with OPF for precise fit and reliable results

Why this low temp radiator is a must-have

The B58C uses a water-to-air charge cooling system. Lowering the coolant temperature in that circuit immediately improves charge air temperature control, which means repeatable power, safer knock resistance and improved consistency in hot weather. This Wagner unit expands fluid capacity and heat exchange area while maintaining airflow to the main engine radiator and A/C condenser.

Vehicle compatibility

• BMW G20 G21 M340i and M340i xDrive 3.0 B58C OPF models
• BMW G29 Z4 M40i 3.0 B58C OPF models
• Toyota GR Supra A90 MK5 3.0 B58C OPF models

Note: Only suitable for vehicles equipped with OPF.

Real-world feedback

We run Wagner cooling hardware on our own B58 cars and our customers consistently report noticeably steadier intake temps on back-to-back pulls, summer drives and track days. It is a confidence-inspiring upgrade for tuned Stage 1 or Stage 2 cars and a smart reliability mod on otherwise stock setups.

Fitting and support

This replaces the factory auxiliary water radiator with a straightforward, plug-in install using OE hose connections. Prefer professional installation? Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Fitment check before dispatch

We can confirm compatibility prior to shipping. Add your UK registration or the last 7 digits of your VIN at checkout and we will verify the match.

Part number and warranty

• Part number: 400001011
• Manufacturer: Wagner Tuning
• Warranty: 2 years manufacturer warranty

Benefits at a glance

• Helps reduce heat soak for consistent performance
• Supports higher boost and ignition targets on tuned cars
• Improves recovery after long pulls and track sessions
• Keeps intake air temperatures more stable in warm climates
• Designed for seamless integration with the OEM cooling circuit

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