Exhaust Headers for Mercedes Benz G55 AMG (2003-2011) 5.4L Supercharged V8

High-Flow Exhaust Headers for 2003-2011 Mercedes Benz G55 AMG (M113 / W463)

Designed for high-performance applications, these mid-length exhaust headers eliminate back pressure and increase volumetric efficiency for the M113 5.4L V8 engine.

The Stock G55 AMG Exhaust Restriction

The factory OEM exhaust manifolds on the W463 G55 AMG chassis are designed primarily for emissions compliance and packaging constraints rather than optimal airflow. The stock cast manifolds suffer from abrupt transitions and narrow primary runners, leading to severe exhaust gas back pressure. This bottleneck traps residual heat in the cylinder head, inducing heat soak, limiting high-RPM scavenging efficiency, and ultimately restricting the M113 V8's power potential and acoustic profile.

The Engineering Solution

These mid-length, high-flow headers directly address OEM flow restrictions by utilizing widened primary pipes and optimized merge collectors. By smoothing the exhaust pulse transitions, this system significantly reduces back pressure, allowing the engine to breathe freely. For naturally aspirated M113 engines, expect a typical yield of 7 to 10 percent in horsepower and torque, while supercharged variants can see up to 15 percent gains. The inclusion of downpipes provides a comprehensive flow upgrade, though professional installation is required as these headers must be welded to your existing exhaust system. Note that installation in the W463 chassis requires navigating a tight V8 engine bay.

Technical Specifications

Compatibility

• Fits LHD and RHD vehicles
• For 2003-2011 Mercedes-Benz G55 AMG (W463) 5.4L V8 (2003-2004 Naturally Aspirated M113 & 2005-2011 Supercharged M113K)

The Mercedes Benz Precision Standard

Upgrading the exhaust flow on your German performance vehicle demands precise tuning and high-quality fabrication. These headers unlock the true aggressive tone of the M113 V8 while providing the reliable power output required for track applications.

Common Questions

Will these exhaust headers fit my 2003-2011 Mercedes-Benz G55 AMG?
Yes, these mid-length exhaust headers are designed for the 2003-2011 Mercedes-Benz G55 AMG (W463 chassis) with the 5.4L M113 V8 engine.

Do these headers fit both Left-Hand Drive and Right-Hand Drive vehicles?
Yes, this exhaust header system is engineered to fit both Left-Hand Drive (LHD) and Right-Hand Drive (RHD) 2003-2011 G55 AMG models.

What kind of horsepower and torque gains can I expect?
By reducing exhaust back pressure with widened primary pipes and optimized merge collectors, naturally aspirated 5.4L M113 engines typically see 7 to 10 percent gains in horsepower and torque, while supercharged 5.4L M113K models can see up to 15 percent gains.

What is included with these headers?
The kit includes mid-length high-flow exhaust headers with widened primary runners, optimized merge collectors, and matching downpipes.

Is welding required for installation?
Yes, professional installation is required because these headers and downpipes must be welded to your existing exhaust system.