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Regular Price: $727.79

Sale Price $499.95

  • Direct fit for the 2019+ BMW M340i (G20)/Z4 (G29) 3.0L
  • Sold as pair
  • 30% increase in core volume
  • Features a 1.57" thick, efficiently brazed aluminum core
  • Additional features below
  • Add coolant to your purchase
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  • Direct fit for the 2019+ BMW M340i (G20)/Z4 (G29) 3.0L
  • Sold as pair
  • 30% increase in core volume
  • Features a 1.57" thick, efficiently brazed aluminum core
  • Full aluminum construction including durable, TIG-welded end tanks
  • Strutted tubes for maximum durability
  • Increased fluid capacity for optimal heat dissipation
  • Efficient temperature regulation for both stock and modified vehicles
  • Mishimoto Lifetime Warranty


Help your 2019+ BMW M340i (G20)/Z4 (G29) 3.0L stay cool with the Mishimoto Performance Auxiliary Radiator Pack! The M340i is becoming an icon for the tuning community, but high coolant temperatures can still bring your track day or canyon carve to a screeching halt.

Luckily, our auxiliary radiators are designed to keep your B58 running at optimal temperatures. For starters, we entirely replaced the slim stock core and plastic end tanks with a full aluminum, TIG-welded construction, sure to stand up to the abuse from the street, track, or drag strip. The core on our new design has also grown. We expanded the core’s thickness to 1.57”, which bumps the core volume by 30% over the stock unit. The updated tube-and-fin design employed on this radiator also expands the external fin surface area by 180% for maximum heat dissipation properties, primarily when used in conjunction with the Mishimoto Performance Aluminum Radiator. To ensure a long-lasting radiator, we also incorporated strutted tubes throughout the core for improved stability and drastically reduce the risk of breaks or leaks.

The Mishimoto Performance Auxiliary Radiator Pack is available in a polished finish for a sleek look under the hood of your 2019+ BMW M340i (G20)/Z4 (G29). Also included is the Mishimoto Lifetime Warranty for a worry-free installation.


(2) Auxiliary Radiators
Mishimoto Lifetime Warranty



Engine Codes B58
Chassis Codes G20
Fits 2020+ BMW M340i
2019+ BMW Z4


Material Aluminum
Overall Height9.5"
Overall Length11.7"
Dual PassFalse
Overall Width2.9"

Mishimoto Automotive (“Mishimoto”) warrants its products under this lifetime limited warranty policy (“Warranty Policy”). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a “Mishimoto Product” and collectively, the “Mishimoto Products”) and (ii) the original purchaser of such Mishimoto Product (“Purchaser”). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.

For our complete warranty policy, please click here.

Mishimoto Lifetime Warranty on ALL Products
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