Secure Checkout Fast US Shipping Affirm Financing All Major Cards

Chargecooler Radiator for the BMW B48 & B58 Engine

  • Sale
  • Regular price $597.80


  • Inlet temperatures lowered by 20°C (68°F)
  • An increase of over 100% extra capacity
  • Triple pass water flow meaning maximum cooling efficiency.
  • Locates in the OEM position
  • Improved cooling performance of the charged air.
  • Volume of 17 litres compared to the OEM of just 7.71 litres.
  • Made in the UK
  • Guaranteed for life

With modern day aftermarket ECU tuning pushing powerful engines harder. In certain conditions the vehicle will run the risk of receiving inadequately cooled air affecting the engines efficiency and ultimately losing power. With this in mind, Forge are proud to present another PolarCooler as the first auxiliary cooling system for the BMW B48 & B58. Following extensive testing on the road and dyno working with 3 different styles of water core with different fin pitch configurations, we are proud to present the ultimate in frontal water cooling solutions.

This product is designed, developed and manufactured entirely in Great Britain and is covered by our worldwide lifetime warranty. We estimate that it will take around 4 hours to complete installation of this product. The cooler is 530mm x 471mm x 68mm compared to the OEM of 576mm x 495mm x 25mm.

FITS — F-CHASSIS BMW WITH B46/B48 (2.0T) OR B58 (3.0T) ENGINE ONLY:

• 1 Series F20/F21 LCI (2015–2019): 120i, 125i, M140i
• 2 Series F22/F23 (2016–2021): 220i, 230i, M240i
• 3 Series F30/F31/F34 LCI (2015–2019): 320i*, 330i, 340i
• 4 Series F32/F33/F36 (2016–2020): 420i*, 430i, 440i

*Euro-spec B48 only — US-market 320i used the N20 engine and is NOT compatible.
US-spec 230i/330i/430i (B46 engine) use the same cooling system and are compatible.

DOES NOT FIT — PLEASE CHECK BEFORE ORDERING:
• Any X-model SUV (X1–X7). The X5/X3 40i share the B58 engine but use a
completely different chassis and front-end — this radiator will not fit.
• G-chassis cars: 2019+ 3 Series (G20), M340i, M440i, 2021+ 4 Series,
2022+ 2 Series (G42), Z4 (G29), Toyota Supra (A90/A91)
• F40 1 Series / F44 2 Series Gran Coupe (transverse engine)
• M2 / M3 / M4 (N55/S55/S58 engines)
• Pre-facelift N20/N55 cars: M135i, M235i, 335i, 435i, 228i, 328i, 428i

Fitment is determined by chassis, not engine code — having a B48 or B58
under the hood is not enough. If you are unsure, message us with your VIN
or year/model/trim before purchasing and we will confirm.
Vehicle Compatibility

This part is confirmed to fit the following vehicles:

BMW

  • 1 Series — F20 (2012-2019)
  • 2 Series — F22 (2014-2021)

Not sure if this fits your car? Contact us with your year, make, model, and engine code.