The TOWMA High-Performance Downpipe for the Mercedes-Benz C63/C63 S W205 unleashes the full potential of the 4.0 V8 bi-turbo engine. This upgrade delivers maximum flow, more direct throttle response, and a dynamic AMG sound. Available as a catless or with a high-flow sports catalytic converter.
Advantages
- Maximum flow — free diameter for minimum restriction
- More power — 25-35 extra hp with ECU tuning
- Faster turbo response — less backpressure, faster spooling
- Aggressive AMG sound — raw, powerful V8 tone
- OEM+ fit — direct mounting without modifications
- High-quality stainless steel — fully TIG-welded
Material & Construction
The TOWMA downpipe is manufactured from high-quality stainless steel and fully TIG-welded for optimum flow and durability.
Available in two variants:
1. Catless (without catalytic converter):
- Maximum flow and performance
- Loudest, most aggressive V8 sound
- Maximum power gain (30-35 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 (25-30 hp with tune)
- Possibly MOT-proof (depending on inspection)
- Suitable for daily use
Performance & Sound
Capital gain:
- Catless: +30-35 hp with ECU tuning
- High-flow cat: +25-30 hp with ECU tuning
- Without tuning: +10-15 hp (only due to better flow)
- Total power with tuning: 540+ hp possible! (standard 510 hp C63 S)
Sound character:
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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)
-
Downshifts: Aggressive backfire and crackling
Installation & Assembly
The downpipe is designed for plug-and-play installation on the original Mercedes mounting points.
Installation time: 2-3 hours for an experienced Mercedes specialist
ECU Tuning: For optimal performance, ECU tuning is recommended.
Compatibility
Suitable for:
- Mercedes-Benz C63 AMG W205 (2015-2021) — 4.0L V8 bi-turbo (476 hp)
- Mercedes-Benz C63 S AMG W205 (2015-2021) — 4.0L V8 bi-turbo (510 hp)
Technical Specifications
| Characteristic |
Specification |
| Brand |
TOWMA Carbon & Performance Parts |
| Material |
Stainless Steel |
| Variants |
Catless or High-Flow Cat |
| Capital gains |
25-35 hp (with tune) |
| Warranty |
3 years |
| Price |
€1,099 |
Frequently Asked Questions
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Do I need ECU tuning? Recommended for optimal performance.
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Is this MOT-proof? Catless is NOT. High-flow cat is possible.
