BenzUnited Parts
Long Tube Headers for Mercedes E500 CLS500 – M113 5.0L V8 NA
Long Tube Headers for Mercedes E500 CLS500 – M113 5.0L V8 NA
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Performance Exhaust Upgrade • TIG-Welded 304 Stainless Steel
Replace the restrictive factory manifolds on your M113-powered Mercedes with BenzUnited Long Tube Headers. Longer primaries and a smooth collector improve exhaust scavenging, sharpening throttle response and shifting the power band toward the top end.
Key Features & Specifications
- High-Flow Design: 1.9″ OD primaries and 2.9″ ID collectors
- Premium Build: SUS-T304 stainless steel, dual TIG welds, 3/8″ CNC flanges
- OEM-Grade Fitment: 4 O₂ bungs included for sensor integration
- Complete Kit: includes gaskets and hardware for a leak-free installation
- Adaptability: weld-in midpipes required for non-AMG catback systems
Compatibility Chart
| Model | Chassis | Years |
|---|---|---|
| Mercedes-Benz E500 (5.0L RWD) | W211 | 2003–2006 |
| Mercedes-Benz CLS500 (5.0L RWD) | W219 | 2003–2006 |
The E500 and CLS500 are not AMG cars — this header is for the M113 5.0L naturally aspirated V8, not the supercharged M113K in the E55 / CLS55.
For non-AMG catback systems, welding is required to connect the included midpipes.
How Our Three Header Styles Compare
| Shorty | Mid-Length | Long Tube | |
|---|---|---|---|
| Power bias | Low & mid-range | Mid-range into top end | Top end |
| Factory cats | Retained | Removed | Removed |
| Road legal | Retains emissions equipment | No — off-road only | No — off-road only |
| Install | Bolt-on, no welding | Welding required | Welding usually required |
| Price band | Lowest | Middle | Highest |
You are viewing the long tube — the most power, the most install work, and no cats. The shorty version for the same cars keeps the cats and bolts on without welding.
You will likely need: O2 sensor extension harness
Long tubes move the rear (post-cat) oxygen sensors well away from the factory harness. Our 24″ O2 sensor extension harness covers the gap with no cutting or splicing. Most Mercedes V8s need two. Far cheaper to add now than to put the car back on the lift.
Recommended Upgrades
Pair these headers with our Custom ECU Tune for the M113 5.0L to recalibrate for the improved exhaust flow.
Why Choose BenzUnited Performance?
- Engineered for M113 5.0L V8 platforms
- Direct fit with premium gaskets and hardware included
- U.S.-based support and fast shipping
Off road use only. Not legal for use on emissions-controlled vehicles or public roads.
