Improved Intake Airflow – Mercedes C63 AMG & C63 S (M177)
W205 C63 & C63 S Intake & Airflow Guide (M177)
The W205 C63 / C63 S equipped with the M177 4.0L Bi-Turbo V8 responds well to intelligent airflow upgrades—but not all intake mods improve real-world performance. This guide breaks down the intake spacers and drop-in air filters that actually make sense, what to avoid if consistency matters, and how to build an OEM+ intake setup that supports tuning without downsides.
Top Picks (W205 C63 / C63 S)
Note: The M177 factory intake uses two panel air filters
How Intake Airflow Works on the M177
The factory M177 intake uses a sealed dual-airbox design engineered for consistent airflow, filtration, and engine bay isolation. As power increases through tuning, restriction and airflow efficiency matter more than added noise or exposed filters.
The goal of a smart intake upgrade is not maximum sound—it’s smoother, less restrictive airflow that supports tuning and repeatable performance without sacrificing OEM refinement.
Airbox Spacer Kits (OEM+ Optimization)
Intake spacer kits optimize the factory airbox inlet path by increasing volume and improving airflow distribution while reducing localized restriction ahead of the turbo inlets. They retain the OEM sealed intake design—making them a strong choice for tuned street cars that value consistency.
M177 Intake Spacer Options
Spacer + Filter Combos
For most owners, the intake spacer + high-flow drop-in filter combo offers the best balance. Filters reduce restriction at the element itself, while spacers improve airflow behavior upstream—without changing the factory intake layout.
This setup is ideal for daily-driven tuned cars that want improved airflow efficiency with OEM-level fitment and reliability.
Open Air Intakes (Sound & Appearance)
Open-element intakes are popular for increased turbo noise and engine-bay aesthetics. While they can perform adequately in motion, they are generally chosen for sound and visual impact rather than airflow consistency.
For drivers focused on repeatable performance and OEM refinement, sealed airbox upgrades are typically the better long-term solution.
Best for sound and aesthetics
FAQ
Do I need to replace both air filters?
Yes. The M177 intake uses two panel filters—replacing both maintains balanced airflow.
Are drop-in filters worth it on a tuned car?
Yes. High-flow drop-in filters reduce restriction while retaining the factory intake design.
Why recommend spacers over open intakes?
Spacers improve airflow efficiency without changing intake layout or filtration strategy. Open intakes are primarily chosen for sound.
Final Thoughts
For the W205 C63 / C63 S, the smartest intake upgrades are the simplest: high-flow drop-in air filters and a properly designed intake spacer. They improve airflow efficiency, support tuning, and preserve the OEM character of the car.
Need help choosing the right setup? Tell us your goals and we’ll point you in the right direction.