M278 Aluminum Intake Tubes – W212 W218 E550 CLS550 Upgrade Kit

Let your M278 4.7L V8 BiTurbo breathe the way it was meant to. These CNC-bent Aluminum Intake Tubes replace the restrictive OEM plastic pipes on W212 / W218 / W207 / C207 550 models—improving airflow, throttle response, and turbo efficiency while keeping a clean OEM+ engine bay appearance.

The stock plastic intake tubes on the M278 4.7L V8 were built for refinement, not maximum flow. Under heat and boost, they can soften and distort, disrupting airflow before the turbochargers. These aluminum tubes give your E 550, CLS 550, or E-Class coupe/cabriolet a smoother, more efficient inlet path that supports tuning, harder driving, and repeatable performance.

🔥 Key Features – M278 Aluminum Intake Tubes

• High-flow aluminum construction: Rigid tubing that won’t crack, flex, or deform under heat and boost like aged plastic.
• Smoother turbo inlet airflow: Reduces turbulence and pressure drop before the turbos for more efficient operation.
• Motorsport-grade silicone couplers: Heat-resistant and boost-rated for stock or tuned M278 applications.
• Direct-fit engineering: Designed around factory airboxes and turbo inlets—no cutting or permanent modifications required.
• Optional Cerakote thermal finish: Helps control radiant heat and improve intake air temperature stability.
• OEM+ stealth appearance: Clean routing that blends perfectly into the engine bay of any E 550 or CLS 550.

📈 Real-World Performance Benefits

• Sharper throttle response: Faster, more stable airflow as you roll into boost.
• Stronger midrange torque: Better volumetric efficiency where the 4.7L biturbo engine makes its power.
• More consistent performance: Less heat soak and smoother airflow for repeatable acceleration.
• Supports tuning and bolt-ons: Ideal for ECU tunes, intake spacers, high-flow filters, and cooling upgrades.

✔️ Compatibility – M278 4.7L BiTurbo (Non-AMG)

Direct fit for the following Mercedes-Benz 550 models equipped with the M278 4.7L V8 Biturbo:

🧰 Installation

• Direct bolt-on replacement for OEM plastic intake tubes.
• Install time: ~45–90 minutes with basic hand tools.
• Compatible with OEM airboxes and high-flow panel filters.
• No tune required—works with stock ECU calibration.

📦 What’s Included

• Left & right CNC-bent aluminum intake tubes (M278-specific)
• High-temp silicone couplers
• Stainless T-bolt clamps
• Optional Cerakote thermal coating (if selected)

🔧 Technical Summary: Airflow & Turbo Efficiency

The M278’s OEM intake tract includes abrupt angles and restriction points where the plastic tubes meet the airbox and turbos. Under higher airflow or tuning, this increases pressure drop and makes the turbochargers work harder to achieve the same boost.

These aluminum tubes offer smoother-radius transitions and a consistent internal diameter, reducing turbulence and stabilizing airflow. The result: more efficient boost, improved mass airflow readings, and noticeably crisper throttle response.

🏁 Built & Tested by BenzUnited

We’ve spent over 12 years daily-driving, tuning, and refining Mercedes-Benz 550 and AMG platforms. Every upgrade we produce is tested in-house across real mileage, real heat, and real boost—not just theoretical dyno curves. That’s why our hardware fits, lasts, and performs where it matters: on the road.