E63 AMG M156 Intake Manifold

the Intake Manifold for the Mercedes-AMG M156 6.2L V8 (found in the E63, C63, and S63) is arguably the “weakest link” of the engine’s exterior components. Because it is made of a specialized magnesium alloy to save weight, it is highly prone to internal corrosion and physical failure.

1. Technical Identification

• Part Number: A1561410801 (This is the complete assembly).

• The Design: It is a dual-stage manifold with internal flaps that switch between long and short runners to optimize torque.

• The Failure Point: The internal center mounting plate (where the throttle bodies attach) is made of a thinner magnesium than the outer shell. Over time, oil vapors and moisture cause this plate to rot, leading to “lean” codes.

2. 2026 Market Pricing (Estimated USD)

Replacing a manifold is a major expense. You generally have three paths in 2026:

3. Symptoms of Failure

If your E63 is behaving poorly, look for these “classic” M156 manifold signs:

• The “Hissing” Sound: A distinct vacuum leak sound at idle.

• Rough Idle / Surging: The car struggles to maintain steady RPM.

• Fault Codes: P0171 and P0174 (System Too Lean, Banks 1 & 2).

• Limp Mode: The car reduces power because it cannot calibrate the air-fuel ratio.

4. The 2026 “Permanent Fix”

Most M156 enthusiasts in 2026 no longer buy new OEM manifolds because they will eventually fail again. Instead, they use a Billet Aluminum Center Plate (from specialists like 63Motorsports or RMT).

• Why it works: Aluminum does not corrode like magnesium. By replacing the rotted center section with a CNC-machined aluminum plate, you effectively “bulletproof” the manifold for the rest of the car’s life.

5. Essential “While You’re In There” Parts

If you are pulling the manifold, you must replace these one-time-use items:

1. Manifold Gaskets (A1561410180): You need two. They are metal crush-style gaskets.

2. PCV Valve (A1560100370): Located at the very back of the manifold. It is nearly impossible to change with the manifold on.

3. Throttle Body O-Rings: To ensure a perfect seal on your new or repaired plate.

4. Brake Booster Vacuum Line: This plastic line becomes extremely brittle and almost always snaps during removal.