Description
Maximize the performance potential of your Audi S6, RS6, S7, or RS7 (C7) EA824 with the Untd. Performance 3″ Catless Downpipe. Engineered specifically for the high-output 4.0T twin-turbo V8, this race-inspired upgrade features a full 3-inch diameter for uncompromising flow, quicker turbo response, and serious power gains. Whether you’re chasing dyno numbers or building a street-dominating machine, this downpipe brings the sound and performance you crave.
The factory catalytic converters create additional restriction within the exhaust system. By replacing them with a 3-inch catless downpipe, exhaust gases can exit the turbochargers more efficiently, helping improve turbocharger response, reduce backpressure, and increase the performance potential of the EA824 engine.
Whether you’re upgrading your vehicle for spirited street driving, building a tuned C7 4.0T, or looking for a more aggressive exhaust note, the Untd. Performance 3″ Catless Downpipe provides the freer-flowing exhaust path needed to support increased performance.
Key Features
- 3″ Catless Design – Maximum Exhaust Flow – Removes the restrictive factory catalytic converter to significantly reduce exhaust backpressure.
- Improved Turbo Response & Performance – Reduced exhaust restriction helps the twin turbochargers evacuate exhaust gases more efficiently.
- Aggressive 4.0T V8 Sound – Produces a deeper, louder, and more aggressive exhaust tone compared to the factory downpipes.
- Increased Performance Potential – Designed to support increased horsepower and torque when paired with the appropriate ECU calibration.
- Durable Construction – Built for demanding high-performance street and competition applications.
- Direct-Fit Design – Designed specifically for the Audi C7 4.0T platform.
- Installation Hardware Included – Includes replacement gaskets, bolts, and required installation hardware where applicable.
- Tune Recommended / Required for Optimal Performance – ECU tuning is strongly recommended to take advantage of the increased exhaust flow and properly address catalyst monitoring.
Estimated Performance Gain
The Untd. Performance 3″ Catless Downpipe reduces exhaust restriction and allows the EA824 4.0 TFSI V8 to flow exhaust gases more efficiently.
On the factory ECU, gains are expected to be relatively modest because the stock calibration is not designed to fully utilize the additional exhaust flow. The largest performance gains come from combining the downpipe with an appropriate ECU calibration.
| Tuning Level | Estimated HP Gain | Estimated Output | Estimated Torque Gain |
|---|---|---|---|
| Stock Tune | ~5–12 HP | ~565–572 HP | ~+10–20 WTQ |
| Stage 1 Tune | ~95–130 HP | ~655–690 HP | ~+100–140 WTQ |
| Stage 2 / Downpipe-Specific Tune | ~105–145 HP | ~665–705 HP | ~+115–160 WTQ |
Performance estimates are based on crank horsepower, 91–93 octane (95–98 RON) pump fuel, and stock turbochargers.
For S6/S7 C7 models producing approximately 420–450 HP, percentage gains can be higher depending on the specific ECU calibration and vehicle configuration. Published tuning data has shown substantial gains on these applications.
It is also important to note that the factory downpipes are not necessarily a major restriction on stock-turbo C7 4.0T applications. As a result, Stage 2 may provide only a modest increase in peak power over Stage 1 on some vehicles, while providing additional benefits in turbo spool, throttle response, exhaust flow, and sound.
Actual results will vary depending on fuel quality, ECU calibration, supporting modifications, ambient conditions, engine condition, turbocharger configuration, and dyno methodology.
⚠️ Check Engine Light Warning
Because this is a catless downpipe, the factory catalytic converter is removed.
The vehicle may trigger a Check Engine Light (CEL) due to catalyst-efficiency and rear-O2 sensor monitoring when operated with the factory ECU calibration.
A properly configured ECU tune is strongly recommended to address catalyst-related monitoring and take advantage of the increased exhaust flow.
For Stage 2 applications, the ECU calibration should be specifically designed for a catless downpipe setup and appropriately manage rear-O2/catalyst monitoring.
Why Upgrade?
The factory C7 4.0T downpipes are designed around emissions compliance, noise control, drivability, and OEM refinement. For modified vehicles, the catalytic converters can create additional exhaust restriction and limit exhaust flow.
The Untd. Performance 3″ Catless Downpipe replaces the factory restrictive section with a larger, freer-flowing exhaust path. This allows the twin-turbocharged V8 to evacuate exhaust gases more efficiently while reducing backpressure.
The result is improved turbocharger response, throttle response, exhaust flow, sound, and overall power potential.
When combined with a properly calibrated ECU tune, the downpipe provides an excellent supporting modification for higher-output C7 4.0T builds.
Compatibility
- Audi S6 C7 – 4.0T TFSI EA824
- Audi S7 C7 – 4.0T TFSI EA824
- Audi RS6 C7 – 4.0T TFSI EA824
- Audi RS7 C7 – 4.0T TFSI EA824
- Audi RS7 C7 – 560 HP
- Audi S6/S7 C7 – approximately 420–450 HP
- 4.0L Twin-Turbocharged V8 EA824
- C7 / C7.5 4.0T applications
⚠️ Important Notice
- CATLESS / OFF-ROAD / COMPETITION USE ONLY
- This product removes the factory catalytic converters.
- Not emissions-legal for use on public roads where emissions regulations prohibit catalyst removal, including applicable jurisdictions in Canada and the United States.
- A Check Engine Light may occur when using the downpipe with the factory ECU calibration.
- ECU tuning is strongly recommended for optimal performance and proper catalyst-monitoring management.
- Stage 2 applications require a downpipe-specific ECU calibration.
- Performance figures are estimates based on typical platform results and will vary depending on vehicle configuration, fuel, tune, supporting modifications, environmental conditions, and vehicle condition.
- Professional installation is recommended.
- Always inspect and verify all exhaust connections, gaskets, fasteners, O2 sensor wiring, and surrounding components after installation.
Key Features:
Full 3” Catless Design for Maximum Exhaust Flow
The Untd. Performance Downpipe removes the restrictive factory catalytic converters and upgrades to a full 3-inch diameter to drastically improve exhaust velocity and reduce backpressure. This setup is ideal for heavily tuned builds and high-boost applications where every bit of flow counts.
Loud, Aggressive Exhaust Tone
The larger diameter and catless design unleash a more aggressive, raw exhaust note from the 4.0T V8. Turbo spool is sharper, pops and crackles are louder, and the overall sound is more visceral and motorsport-inspired. This is the sound of true performance.
Increased Power & Sharper Turbo Response
By optimizing exhaust flow, this downpipe allows the turbos to spool faster and breathe easier. The result is stronger throttle response, reduced lag, and a noticeable bump in horsepower and torque throughout the RPM range. Whether at the track or on spirited drives, the difference is immediate and exhilarating.
High-Quality Construction
Crafted from premium 304 stainless steel, the 3” Catless Downpipe is built to handle extreme heat and pressure. TIG-welded for strength and durability, it features precision CNC-machined flanges for a secure, leak-free fit. Built to perform under the most demanding conditions.
Direct Bolt-On Fitment
Designed for a seamless installation, this downpipe bolts directly to the factory turbos and mid-pipes. No modifications or welding required—just pure, bolt-on performance.
Track-Ready, Emissions-Delete Setup
Purpose-built for off-road and motorsport use, this downpipe is ideal for full race builds and high-output street cars where emissions compliance is not required. Its catless design provides the ultimate in performance and sound.
Compatibility:
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Audi S6 (C7) 4.0T Twin-Turbo V8
-
Audi RS6 (C7) 4.0T Twin-Turbo V8
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Audi S7 (C7) 4.0T Twin-Turbo V8
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Audi RS7 (C7) 4.0T Twin-Turbo V8
For drivers looking to push their C7-platform Audi to the limit, the Untd. Performance 3″ Catless Downpipe delivers unmatched flow, sound, and power. Built for enthusiasts, tuned for response, and designed to perform—this is the downpipe your 4.0T was waiting for.
⚠️ Note: This product is intended for off-road and track use only. Not emissions-compliant in all regions. Please check your local laws before installation.
ECU PROGRAMMATION WOULD BE REQUIRED FOR OPTIMAL PERFORMANCE & REMOVAL OF CHECK ENGINE LIGHT
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