The TOWMA High-Performance Downpipe for the Mercedes-Benz E63/E63S AMG W213 gives your engine bay more freedom, a more intense V8 sound, and provides the perfect foundation for tuning or sportier driving. Developed for the 4.0 V8 bi-turbo engine, it's available as a catless or high-flow sports catalytic converter.
Advantages
- Maximum flow — large diameter for minimal restriction
- More power — 30-40 extra hp with ECU tuning
- Faster turbo response — less backpressure, faster spooling
- Aggressive V8 sound — deep, powerful AMG sound
- OEM+ fit — direct mounting without modifications
- SS304 stainless steel — high-quality stainless steel
- TIG welded — perfect welds for optimum strength
Material & Construction
The TOWMA downpipe is manufactured from high-quality SS304 stainless steel and fully TIG-welded for maximum strength and flow.
Available in two variants:
1. Catless (without catalytic converter):
- Maximum flow and performance
- Loudest, most aggressive V8 sound
- Maximum power gain (35-40 hp with tuning)
- Not MOT-proof in the Netherlands
- For track/export use only
2. High-Flow Sports Catalyst (200-cell):
- Balance between performance and emissions
- Sporty V8 sound, slightly less loud than catless
- Good power gain (30-35 hp with tune)
- Possibly MOT-proof (depending on inspection)
- Suitable for daily use
Performance & Sound
Capital gain:
- Catless: +35-40 hp with ECU tuning
- High-flow cat: +30-35 hp with ECU tuning
- Without tuning: +12-18 hp (only due to better flow)
- Total power with tuning: 650+ hp possible! (standard 612 hp E63S)
Sound character:
The TOWMA downpipe transforms the 4.0L V8 bi-turbo:
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Idle: Deeper, more present V8 bass
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Acceleration: Aggressive turbo whoosh and wastegate flutter
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High revs: Loud, race-inspired V8 sound
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Deceleration: Pops and bangs (with tune)
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Downshifts: Aggressive backfire and crackling
Installation & Assembly
The downpipe is designed for direct mounting on the original Mercedes mounting points.
Installation time: 3-4 hours for an experienced Mercedes specialist
ECU Tuning: For optimal performance, ECU tuning is HIGHLY recommended. Popular tuners: Renntech, Weistec, Eurocharged.
Compatibility
Suitable for:
- Mercedes-Benz E63 AMG W213 (2017+) — 4.0L V8 bi-turbo (571 hp)
- Mercedes-Benz E63S AMG W213 (2017+) — 4.0L V8 bi-turbo (612 hp)
- Mercedes-Benz E63 AMG S213 Estate (2017+)
- Mercedes-Benz E63S AMG S213 Estate (2017+)
Please note: Check your engine code before ordering.
Technical Specifications
| Characteristic |
Specification |
| Brand |
TOWMA Carbon & Performance Parts |
| Product |
High-Performance Downpipe |
| Material |
SS304 Stainless Steel |
| Welding method |
TIG welded |
| Diameter |
76mm (3 inch) |
| Variants |
Catless or High-Flow Cat (200-cell) |
| Fit |
OEM+ direct fit |
| Suitable for |
E63/E63S AMG W213 (2017+) |
| Capital gains |
30-40 hp (with ECU tune) |
| Installation |
Plug and play, no welding |
| Warranty |
3 years on construction and fit |
| Price |
€2,399 |
Maintenance & Warranty
Maintenance:
- Check flanges for leaks regularly
- Inspect gaskets annually
- Clean the outside with stainless steel cleaner
- Check mounting bolts for tightness
Warranty:
TOWMA offers a 3-year warranty on construction, fit and finish.
Frequently Asked Questions
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Do I need ECU tuning? Not required, but highly recommended. Without tuning, you'll gain 12-18 hp, with tuning, you'll gain 30-40 hp.
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Is this MOT-proof? Catless is NOT. High-flow cat is possible, depending on inspection.
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Will this fit my E63S? Yes, the E63 and E63S share the same engine and exhaust layout.
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How much power can I achieve? 650+ hp is possible with a downpipe and ECU tune on an E63S.
