Description
Gain additional performance from your Audi SQ5 B9 3.0T TFSI EA839 with the Untd. Performance Catted Downpipe with Heat Shield. Designed to reduce the restriction of the factory exhaust system while retaining a high-flow catalytic converter, this downpipe provides improved exhaust flow, turbocharger response, and power potential without going completely catless.
The high-flow catalytic converter allows the turbocharged 3.0T V6 to evacuate exhaust gases more efficiently, helping reduce backpressure and improve overall engine response. When combined with ECU tuning, the downpipe provides increased airflow capacity to support higher boost levels and additional horsepower while maintaining a more refined emissions profile than a catless setup.
Key Features
High-Flow Catted Design – Improved Exhaust Flow
The high-flow catalytic converter significantly reduces exhaust restriction compared with the factory downpipe while retaining a catalytic element. This provides a strong balance between performance, sound, and emissions equipment.
Improved Turbo Response & Performance
Lower exhaust backpressure helps the EA839 turbocharger operate more efficiently, potentially improving spool characteristics, throttle response, and overall power delivery.
200-Cell / High-Flow Catalyst
The performance-oriented catalytic design allows increased exhaust flow while maintaining catalyst function. This makes the downpipe a more practical alternative to a completely catless system.
Enhanced 3.0T Sound
The freer-flowing design allows more of the EA839’s characteristic turbocharged V6 exhaust note to come through while maintaining a more refined sound compared with a catless configuration.
Heat Shield Included
The included heat shield helps manage radiant exhaust heat and provides additional protection for surrounding components in the engine bay and underbody area.
Built for Tuned Applications
The increased exhaust-flow capacity makes this downpipe well suited for vehicles running Stage 1 and Stage 2 ECU calibrations and other supporting modifications.
Direct-Fit Design
Designed specifically for the Audi B9 3.0T EA839 platform for installation using the factory mounting locations.
Installation Hardware Included
Includes required installation hardware such as replacement gaskets, bolts, and related installation hardware where applicable.
Tune-Friendly Upgrade
A tune is not strictly required for the downpipe to function, but ECU tuning is recommended to fully take advantage of the increased exhaust-flow capacity and performance potential.
Estimated Performance Gain
Actual results will vary depending on ECU calibration, fuel quality, supporting modifications, vehicle condition, and dyno methodology. The following estimates are based on the Audi S4/S5 B9 3.0T EA839, rated at approximately 349 HP, with the factory turbocharger and 91–93 octane pump fuel.
| Tuning Level | Estimated HP Gain | Estimated Output | Estimated Torque Gain |
|---|---|---|---|
| Stock Tune | ~5–10 HP | ~354–359 HP | ~5–15 WTQ |
| Stage 1 Tune | ~65–85 HP | ~414–434 HP | ~70–100 WTQ |
| Stage 2 / Downpipe-Specific Tune | ~95–116 HP | ~444–465 HP | ~100–135 WTQ |
Stock Tune:
With the factory ECU calibration, the high-flow catted downpipe can provide a modest improvement from reduced exhaust backpressure and slightly improved turbo response. Estimated gains are approximately +5 to +10 HP and +5 to +15 WTQ.
Stage 1 Tune:
A Stage 1 ECU calibration can take advantage of the factory hardware’s increased boost and optimized ignition and fueling strategy. Estimated output is approximately 414–434 HP, representing roughly +65 to +85 HP over the 349 HP baseline.
Stage 2 / Downpipe-Specific Tune:
When paired with a Stage 2 ECU calibration specifically designed for a high-flow catted downpipe, estimated output increases to approximately 444–465 HP, representing approximately +95 to +116 HP over stock, with estimated torque gains of approximately +100 to +135 WTQ.
A catted downpipe may produce slightly less peak power than an equivalent catless setup, but it provides a balance between increased exhaust flow, performance, sound, and catalytic function.
Performance figures are estimates only. Actual results will vary based on ECU calibration, fuel, supporting modifications, ambient conditions, dyno type, and vehicle condition.
Check Engine Light & ECU Tuning
One of the major advantages of the high-flow catted design is the potential for improved catalyst efficiency compared with a catless downpipe.
Many vehicles can remain CEL-free with a properly functioning high-flow catalytic converter, although catalyst monitoring varies depending on the vehicle, ECU software, catalyst condition, and calibration.
Some applications may still require a Stage 2 ECU file or an appropriate O2 solution to prevent catalyst-efficiency fault codes.
For optimal performance, a compatible ECU tune is recommended, particularly when operating the vehicle at Stage 2 power levels.
Why Upgrade?
The factory downpipe is designed to balance emissions control, noise, durability, and everyday drivability. For performance-oriented applications, the factory exhaust restriction can limit flow as boost and power levels increase.
The Untd. Performance high-flow catted downpipe reduces this restriction while retaining a catalytic converter, making it an excellent option for drivers who want increased performance without going completely catless.
The downpipe can help:
- Reduce exhaust backpressure
- Improve turbocharger response
- Improve throttle response
- Increase exhaust-flow capacity
- Support higher-power ECU calibrations
- Enhance 3.0T exhaust sound
- Retain a high-flow catalytic converter
- Provide a more practical alternative to a catless downpipe
Compatibility
Audi SQ5 B9 B9.5
- Audi SQ5 B9 B9.5 3.0 TFSI EA839
The downpipe is designed around the Audi 3.0 TFSI EA839 platform and is intended for compatible B9 applications.
Important Notice
⚠️ HIGH-FLOW CATALYTIC CONVERTER / PERFORMANCE USE
This product retains a high-flow catalytic converter but is still an aftermarket emissions component. Emissions legality, inspection requirements, and road-use regulations vary by jurisdiction. Verify local regulations before installation or use on public roads.
A high-flow catted downpipe may remain CEL-free on many vehicles, but catalyst-efficiency monitoring can vary. A compatible Stage 2 ECU calibration may be required for some applications.
Professional installation and ECU calibration by a qualified performance specialist are recommended.
Estimated horsepower and torque figures are not guaranteed and will vary depending on fuel, tune, supporting modifications, environmental conditions, dyno methodology, and vehicle condition.
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