Wagner Tuning BMW B58 Low Temperature Performance Radiator & Charge Cooler Heat Exchanger Upgrade - M140i M240i 340i 440i (400001002)

Wagner Tuning High-Capacity Coolant Heat Exchanger for BMW B58 M140i, M240i, 340i, 440i

Want rock-solid intake temps and consistent performance from your turbocharged 3.0 straight-six? This premium Wagner Tuning auxiliary cooler is engineered for the B58 water-to-air intake charge circuit, delivering serious thermal headroom for spirited road use and track days. By massively increasing fluid capacity and core thickness, it helps suppress heat soak, stabilise IATs and keep power repeatable on standard cars and remapped builds alike.

The uprated core offers a 117 percent increase in coolant volume compared with the factory unit, with a 68 mm thick matrix designed to transfer heat efficiently while preserving airflow to the primary engine radiator. It mounts exactly like the original with OE-style connectors, arrives with fitting instructions and features a durable heat-conductive anti-corrosion coating for long-term reliability.

Key reasons to choose this B58 cooling solution

• Major jump in thermal capacity for the B58 liquid-to-air charge system
• 117 percent more fluid volume than the stock cooler for greater heat rejection
• Helps reduce intake temperatures and combats heat fade on repeated pulls
• Ideal for fast road, track sessions and tuned Stage 1 or Stage 2 calibrations
• Optimised core profile maintains airflow to the main engine radiator
• Heat-conductive protective coating resists corrosion and preserves efficiency
• Direct-fit replacement with factory-style mounts and hose connections

We have installed this Wagner Tuning cooler on multiple B58 cars and the feedback is consistently positive. Owners report steadier charge temps and stronger, repeatable performance during hard driving. If you are chasing a dependable cooling upgrade for a BMW M140i, M240i, 340i or 440i, this is a proven choice.

Who is it perfect for

• Daily-driven B58s wanting dependable temperature control
• Track day builds that need sustained cooling capacity
• Remapped cars seeking a robust coolant-side upgrade for the liquid intercooler loop

Vehicle compatibility

For BMW models equipped with the 3.0 B58B30M0 engine:

• BMW M140i
• BMW M240i
• BMW 340i
• BMW 440i

Technical data

Factory cooler:
576 mm x 495 mm x 27 mm
Volume: 7.70 litres
Area: 2851 cm²

Wagner Tuning cooler:
524 mm x 468 mm x 68 mm
Volume: 16.70 litres
Area: 2454 cm²

Installation

Direct replacement with OE-style fitment and connections. Installation instructions included.

Prefer professional fitting? MJ Modifications in Warwickshire can install this for you. Request a quote at info@mjmodifications.co.uk.

Compatibility check

We will verify fitment before dispatch. Add your UK registration number or the last 7 digits of your VIN at checkout.

Part number

400001002

Brand

Wagner Tuning

Search terms customers use

B58 cooling system upgrade, BMW M140i charge cooler radiator, BMW M240i coolant heat exchanger, 340i water-to-air intercooler radiator, 440i auxiliary radiator, B58 IAT reduction, BMW heat soak solution, uprated B58 cooler UK, performance cooling kit for BMW 3.0 turbo, Wagner B58 cooler 400001002, M140i cooling system, M240i heat exchanger upgrade, 340i intake temp control, 440i track cooling, BMW B58 coolant capacity increase, B58 front mount heat exchanger, BMW tuning parts UK cooling.