The TOWMA High-Performance Downpipe for the Audi RS6 C8 fully unleashes the raw power of the 4.0 TFSI twin-turbo V8. This upgrade offers maximum exhaust flow, an explosive V8 sound, and provides the perfect foundation for Stage 2 tuning. Available as a catless or high-flow sports catalytic converter.
Advantages
- Maximum flow — free diameter for minimum restriction
- More power — 30-40 extra hp with Stage 2 tuning
- Faster turbo response — less backpressure, faster spooling
- Explosive V8 sound — deep, aggressive tone
- OEM+ fit — direct mounting without modifications
- T304 Stainless Steel — High-performance stainless steel for extreme temperatures
- TIG welded — perfect welds for optimal strength and flow
- Optional heat shield — extra thermal protection
Material & Construction
The TOWMA downpipe is manufactured from high-quality T304 stainless steel and fully TIG-welded for maximum strength and optimal flow.
The free diameter pipe without internal restrictions ensures maximum exhaust flow, resulting in:
- Faster turbo response — both turbos spool up faster
- More power — especially in the mid-range rev range
- Better throttle response — more direct throttle response
- Higher top speed — less exhaust restriction
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 Stage 2)
- 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 gains (30-35 hp with Stage 2)
- Possibly MOT proof (depending on inspection)
- Suitable for daily use
Optional heat shield:
For additional thermal protection, the downpipe is optionally available with a heat shield. This protects surrounding components from the extreme heat of the turbochargers.
Performance & Sound
Capital gain:
- Catless: +35-40 hp with Stage 2 ECU tuning
- High-flow cat: +30-35 hp with Stage 2 ECU tuning
- Without tuning: +12-18 hp (only due to better flow)
- Total power with Stage 2: 700+ hp possible!
Sound character:
The TOWMA downpipe transforms the 4.0 TFSI twin-turbo V8:
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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: Explosive pops and bangs (with tune)
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Downshifts: Aggressive backfire and crackling
Note: Catless is very loud for a wagon. High-flow cat is sportier but more bearable for everyday use.
Installation & Assembly
The downpipe is designed for plug-and-play installation on the original Audi mounting points.
Installation steps:
- Lift the RS6 and place it on a lifting platform
- Remove original downpipe (3 bolts top, 2 bolts bottom)
- Install new TOWMA downpipe with supplied gaskets
- Install optional heat shield (if ordered)
- 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 an experienced Audi specialist
Recommendation: Professional installation by a certified Audi specialist or tuner is recommended.
ECU Tuning: For optimal performance, Stage 2 ECU tuning is HIGHLY recommended. The downpipe alone provides 12-18 hp, but with Stage 2 tuning it adds 30-40 hp. Popular tuners: APR, Unitronic, IE, GIAC.
Compatibility
Suitable for:
- Audi RS6 Avant C8 (2020+) — 4.0 TFSI twin-turbo V8 (600 hp)
Not suitable for:
- Audi RS6 C7 (2013-2018) — previous generation
- Audi A6/S6 C8 — different engine
Note: This is only for the C8 generation (2020+) with a 4.0 TFSI engine. Check your engine code before ordering.
Technical Specifications
| Characteristic |
Specification |
| Brand |
TOWMA Carbon & Performance Parts |
| Product |
High-Performance Downpipe |
| Material |
T304 Stainless Steel |
| Welding method |
TIG welded |
| Diameter |
76mm (3 inch) |
| Variants |
Catless or High-Flow Cat (200-cell) |
| Heat shield |
Optionally available |
| Fit |
OEM+ direct fit |
| Suitable for |
RS6 C8 (2020+) |
| Capital gains |
30-40 hp (with Stage 2 tune) |
| Installation |
Plug and play, no welding |
| Warranty |
3 years on construction and fit |
| Price |
€1,499 |
Maintenance & Warranty
Maintenance:
- Check flanges for leaks regularly
- Inspect gaskets annually
- Check heat shield for damage (if fitted)
- 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.
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, and with Stage 2 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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How loud is this for a wagon? Catless is very loud. High-flow cat is sporty but more bearable for daily use and family use.
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Will I get a check engine light? Possibly. This can be resolved with Stage 2 tuning or O2 sensor spacers.
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What is Stage 2 tuning? Stage 2 is ECU tuning specifically for downpipe upgrades. Stage 1 is software only, Stage 2 is software + hardware (downpipe).
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Do I need the heat shield? Recommended for extra protection, but not mandatory.
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How much power can I achieve with Stage 2? 700+ hp is possible with a downpipe and Stage 2 tune. The standard output is 600 hp.
