The TOWMA High-Flow Downpipe for the Mercedes-Benz C63 SE Performance (W206) was developed for the new-generation hybrid C63 with the M139L 2.0L turbo engine. This downpipe unlocks the full potential of the turbo engine with maximum flow, an aggressive sound, and a perfect fit—an essential upgrade for the new C63.
Advantages
- Maximum flow — free diameter for minimum restriction
- More power — 20-30 extra hp with ECU tuning
- Faster turbo response — less backpressure, faster spooling
- Aggressive sound — deep, sporty character for hybrid C63
- OEM+ fit — direct mounting on original mounting points
- T304 stainless steel — high-quality construction for long life
- TIG welded — perfect welds for optimal flow
Material & Construction
The TOWMA downpipe is manufactured from high-quality T304 stainless steel and fully TIG-welded for optimum strength and durability.
The free-diameter pipe (without internal restrictions) ensures maximum exhaust flow. This significantly reduces backpressure compared to the OEM downpipe, resulting in:
- Faster turbo response — turbo spools up faster
- More power — especially in the mid-range rev range
- Better throttle response — more direct throttle response
- Higher top speed — less exhaust restriction
Catless (without catalyst):
- Maximum flow and performance
- Loudest, most aggressive sound
- Maximum power gain (25-30 hp with tuning)
- Not MOT-proof in the Netherlands
- For track/export use only
Note: The W206 C63 SE Performance has a hybrid setup with a 2.0L turbo engine (M139L) and an electric motor. This downpipe is specific to the turbo engine.
Performance & Sound
Capital gain:
- Catless: +25-30 hp with ECU tuning
- Without tuning: +8-12 hp (only due to better flow)
- Total power with tune: 500+ hp (engine) + 204 hp (electric) = 700+ hp!
Sound character:
The TOWMA downpipe transforms the exhaust sound of the new C63:
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Idle: Deeper, more present bass
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Acceleration: Aggressive turbo whoosh and wastegate flutter
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High revs: Loud, race-inspired exhaust note
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Deceleration: Pops and bangs (with tune)
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Hybrid mode: Interesting contrast between electric quiet and turbo loud
Note: The new C63 sounds different from the old V8. The downpipe gives the 2.0L turbo a more aggressive, sportier character, but it remains a 4-cylinder sound.
Installation & Assembly
The downpipe is designed for plug-and-play installation on the original mounting points.
Installation steps:
- Lift the car and place it on a lift or axles
- Remove original downpipe (3 bolts top, 2 bolts bottom)
- Caution: Hybrid components nearby — handle with care!
- Install new TOWMA downpipe with supplied gaskets
- Tighten all bolts to specifications (45-50 Nm)
- Check for leaks upon initial start-up
- Reset error codes (if present)
Installation time: 2-3 hours for experienced technicians
Recommendation: Professional installation by a certified Mercedes specialist or tuner is STRONGLY recommended due to the proximity of hybrid components.
ECU Tuning: For optimal performance, ECU tuning is highly recommended. The downpipe alone provides 8-12 hp, but with tuning it can add 25-30 hp. Popular tuners: Renntech, Weistec, Eurocharged.
Compatibility
Suitable for:
- Mercedes-Benz C63 SE Performance W206 (2022+)
- Engine: M139L 2.0L turbo + electric motor (476 hp total standard)
Not suitable for:
- Mercedes-Benz C63 AMG W205 (2015-2021) — old V8 generation
- Mercedes-Benz C43 AMG W206 — different engine
- Mercedes-Benz C-Class without AMG
Please note: This is ONLY for the new W206 C63 SE Performance (2022+) with a hybrid setup. Please check your VIN before ordering.
Technical Specifications
| Characteristic |
Specification |
| Brand |
TOWMA Carbon & Performance Parts |
| Product |
High-Flow Downpipe Catless |
| Material |
T304 Stainless Steel |
| Welding method |
TIG welded |
| Diameter |
76mm (3 inch) |
| Variant |
Catless (without catalytic converter) |
| Fit |
OEM+ direct fit |
| Suitable for |
C63 SE Performance W206 (2022+) |
| Capital gains |
25-30 hp (with ECU tune) |
| Installation |
Plug and play, no welding |
| Warranty |
3 years on construction and fit |
| Price |
€1,799 |
Maintenance & Warranty
Maintenance:
- Check flanges for leaks regularly
- Inspect gaskets annually
- Clean the outside with stainless steel cleaner for a shine
- Check mounting bolts for tightness
Warranty:
TOWMA offers a 3-year warranty on construction, fit, and finish. The warranty covers manufacturing defects, leaks, and fit issues. Damage due to improper installation, accidents, or misuse is not covered by the warranty.
Note: Installing a downpipe may affect your manufacturer's warranty. Check with your dealer before installing.
Frequently Asked Questions
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Do I need ECU tuning? Not required, but highly recommended. Without tuning, you'll gain 8-12 hp, with tuning, you'll gain 25-30 hp.
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Is this MOT-proof? No, catless is not MOT-proof in the Netherlands. Only for track/export use.
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How loud is this? Significantly louder than OEM. The 2.0L turbo has a more aggressive, sportier character.
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Will I get a check engine light? Possibly. This can be resolved with ECU tuning or O2 sensor spacers.
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Does this sound like the old V8 C63? No, it's still a 4-cylinder sound. More aggressive and sportier than OEM, though.
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Does this affect hybrid functionality? No, the downpipe only affects the combustion engine, not the electric motor.
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Can I install this myself? With basic tools and experience, yes, but professional installation is recommended due to hybrid components.
Free shipping in the Netherlands on orders over €50. Direct delivery from stock.
