Performance Air Filter for Mercedes-AMG A 45, CLA 45 & GLA 45 (2013-2019)

High-Velocity Induction for the Mercedes M133 AMG Engine

Who It’s For: Engineered for Mercedes-Benz AMG owners running the high-boost M133 powerplant who are tired of the stock paper filter choking their turbo’s potential.

The Symptom: The factory intake system on the M133 engine is a masterpiece of engineering, but it’s hamstrung by a disposable paper element designed for cost-effective servicing, not peak volumetric efficiency. In a high-pressure turbo application like the A 45 or CLA 45, the engine struggles to pull air through dense paper fibers as RPMs climb.

This creates a significant pressure drop across the filter, forcing the turbocharger to work harder to hit its target boost, which increases intake air temperatures and blunts throttle response during spirited canyon runs or track sessions.

The Engineering Fix: This BMC performance filter replaces the restrictive factory media with a multi-layered cotton gauze saturated with low-viscosity oil. By utilizing a "Full Moulding" production process, the filter is created from a single mold with no welded joints, ensuring structural integrity even under the heavy suction of the AMG twin-scroll turbo.

The physics are simple: we are increasing the cross-sectional flow area while improving filtration density. This kit captures impurities as small as 7 microns—surpassing the OEM 10-micron standard—while significantly reducing the resistance in the intake tract for a sharper, more immediate throttle snap.

Why Mechanics Choose This Kit

• Precision Filtration: Captures particles down to 7 microns, providing superior protection for the M133’s sensitive internal components compared to the 10-micron factory limit.
• Thermal Stability: The epoxy-coated alloy mesh protects the cotton media from petrol fumes and oxidation, maintaining its shape and flow characteristics under the extreme under-hood heat of the AMG engine bay.
• Lifetime Sustainability: Unlike disposable OEM filters that end up in a landfill, this unit is fully washable and regenerable, designed to last the entire lifespan of your vehicle.

Technical Specifications

Compatibility & OEM Reference

Fits the following vehicles (BMC fitment data):

• Mercedes CLA (C117/X117) AMG CLA 45 (360 HP) | 2013-2015
• Mercedes CLA (C117/X117) AMG CLA 45 (381 HP) | 2015-2018
• Mercedes A-Class (W176) AMG A 45 (360 HP) | 2013-2015
• Mercedes A-Class (W176) AMG A 45 (381 HP) | 2015-2018
• Mercedes GLA (X156) AMG GLA 45 (360 HP) | 2014-2015
• Mercedes GLA (X156) AMG GLA 45 (381 HP) | 2015-2019

OEM Cross Reference (BMC): MERCEDES-BENZ A1330940104

The Performance Promise

Buy with confidence. We understand the intricacies of the M133 platform. This isn’t just a filter; it’s a tool to help your AMG breathe properly. Backed by real automotive experts and fast shipping.

Common Questions

Which AMG models does it fit?
BMC lists the AMG A 45 W176 and CLA 45 C117 / X117 (2013-2018) and the AMG GLA 45 X156 (2014-2019), both 360 and 381 HP versions.

Is it a direct fit?
Yes. It replaces the factory element in the stock airbox with no modifications.

Can I clean and reuse it?
Yes. Wash and re-oil it with a BMC regeneration kit.

How fine is the filtration?
The multi-layer oiled cotton traps particles down to 7 microns.

What will I notice after installing it?
Sharper throttle response and a stronger intake sound.