M117 Tri-Y Exhaust System for Mercedes-Benz W/C126
Rare Factory-Type Performance Manifold Upgrade for 500/560 V8 Models
Offered here is a desirable Mercedes-Benz Tri-Y exhaust system designed for M117-powered W126 S-Class sedans and C126 coupes (1986-1991). This system includes authentic Mercedes Tri-Y tubular headers, a ceramic-coated downpipe and Y-pipe, EGR components, and a partial rear exhaust section originally removed from a 1991 Japan-market 560SEL AMG.
This is an original Mercedes design—not a reproduction—ensuring factory-correct fitment and performance on LHD W126 models equipped with the 500 or 560 M117 V8.
Performance & Benefits
The factory Tri-Y headers are widely regarded as the most desirable OEM performance upgrade for the M117 V8, providing a free-flowing alternative to the restrictive U.S.-market log manifolds. When fitted to a U.S.-spec 500/560, these headers are known to offer:
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+25–30 estimated horsepower gain
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Reduced backpressure for improved torque
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Faster exhaust gas evacuation
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Better throttle response
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Enhanced top-end power without tuning changes
The design pairs cylinders in a tuned “Y” configuration to promote scavenging, reducing exhaust turbulence and allowing the M117 to breathe more efficiently. These manifolds were favored by AMG and are often found on high-spec Euro performance builds.
Components & Condition
Included items have been recently ceramic coated for improved heat control, corrosion resistance, and longevity. Most of the system is bolt-on for the W126 560SEL, and the headers fit both sedan and SEC coupe models.
Included Components
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Authentic Mercedes Tri-Y headers (4 pieces)
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Downpipe + Y-pipe (ceramic coated)
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EGR valve & covers
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Metal Cat catalytic converter with welded O₂ bung
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Custom cat-delete extension pipe with matching flanges
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Partial rear exhaust section from Japan-market 560SEL AMG
New mounting hardware included
Exclusions
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Rear muffler not included
Mercedes OEM Header Part Numbers
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PN 117 142 45 02
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PN 117 142 46 02
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PN 117 142 48 02
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PN 117 142 51 02
Fitment
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Chassis: W126 (SE/SEL) and C126 (SEC)
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Engines: M117 500 & 560 V8
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Model Years: 1986–1991 (Late Gen II)
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Steering: Fits LHD models
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Direct Bolt-In: Complete system bolts into 560SEL
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Adaptation: Can fit 500 models; shop installation recommended
This setup is ideal for owners seeking OEM-plus performance, AMG-style upgrades, or period-correct modifications.
Authenticity
The system retains original Mercedes-Benz stampings on the header castings and pipes, confirming factory origin. These pieces are not aftermarket reproductions, and their presence on Japan-market AMG vehicles underscores their desirability.
Why These Headers Matter
Unlike the common U.S. cast manifolds, these tubular Tri-Y units:
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Flow similarly to early AMG headers
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Provide measurable gains without ECU tuning
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Reduce under-hood heat when ceramic coated
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Improve engine longevity by reducing exhaust stress
This makes them a highly sought-after upgrade for collectors, performance enthusiasts, and owners building OEM-plus resto-mods.
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