M133 Front Mount + Auxiliary Heat Exchanger Kit for Mercedes CLA45 & GLA45 AMG

The factory cooling system on the M133 2.0L turbo is the first to give up under boost, heat, or hard driving. This full cooling upgrade kit gives you both a high-capacity front mount heat exchanger and an auxiliary unit working in parallel — delivering the best possible intake air temperature control and sustained power delivery.

• ✅ Significantly lower intake air temps (IATs) under load
• ✅ Reduced heat soak during repeated pulls or tracktime
• ✅ Stronger, more consistent horsepower and torque
• ✅ Better throttle response and more consistent boost
• ✅ Supports tuned setups and aggressive driving in hot climates

What’s Included in the Kit

1. Front Mount Heat Exchanger

• Larger core with improved coolant flow
• TIG-welded aluminum construction
• Direct bolt-on — no cutting or modification
• Designed for high-boost and high-load use

2. Auxiliary Heat Exchanger

• Works in parallel with the front mount for extra cooling capacity
• Furnace-brazed core + billet end tanks
• Bolt-on installation using factory mounting points
• Ideal for Stage 1/2 tuned cars and hot weather driving

Exact Fitment

• Mercedes-AMG CLA45 (C117) 2014–2019
• Mercedes-AMG GLA45 (X156) 2015–2020
• Mercedes-AMG A45 (W176)

M133 2.0L Turbo only • Will not fit M139-equipped 45S models

BenzUnited Parts • Track-Tested M133 Cooling • 30-Day Returns