The PLM Heat Exchanger XL PLM-ME55-HEAT-EXCHANGER-XL is the most efficient bolt-on cooling upgrade for your Mercedes-Benz E55 or CLS55 AMG 5.5L supercharged engine. Now 25% larger than the standard version, the XL delivers unmatched cooling performance with increased fluid capacity and fin area to combat heat soak even in the most demanding conditions.

With 2.25 liters of coolant capacity and 4000 square inches of fin surface, this is the heat exchanger you need if you're pushing boost or power. It’s built from TIG-welded aluminum, featuring non-epoxied furnace-brazed cores and CNC-machined billet aluminum necks for long-term reliability and superior thermal efficiency.

VEHICLE FITMENT

• Mercedes-Benz E55 AMG – 5.5L Supercharged

• Mercedes-Benz CLS55 AMG – 5.5L Supercharged

Note: Direct bolt-on for E55. CLS55 requires drilling 2 holes in the included side brackets (no modification to the vehicle itself).

HEAT EXCHANGER SPECS

• Overall Length: 35.5"

• Core Size (without end tanks): 28.5"

• Height: 5.5"

• Core Thickness: 3.0" (XL Version)

• Fluid Capacity: 2.25 liters

• Fin Surface Area: 4000 in²

KEY FEATURES

• 25% larger than standard PLM heat exchanger

• CNC-machined billet aluminum necks

• 2.25L coolant capacity for improved thermal load handling

• Furnace-brazed, non-epoxied core construction

• High-density fin core for efficient heat exchange

• 100% TIG-welded for durability and strength

• Bolt-on installation – no vehicle cutting required

• Designed to drastically reduce intake air temperatures (IAT)

• Compatible with PLM Johnson Pump & Water Wetter cooling package

INSTALLATION INFO

• Basic hand tools required

• E55: bolt-on fit

• CLS55: requires 2 bracket holes (no vehicle mod)

• Bumper removal required for installation

Tip: Since the bumper is removed, consider bundling with the Johnson pump & Redline Water Wetter for a complete cooling system overhaul—just $100 more. Available HERE