Audi S4 B6 B7 4.2 V8 Catless Downpipes
Quattro 6-Speed Manual • High Flow Upgrade
XS-POWER Performance Parts | View Exhaust Systems
What This Does
Removes the factory restriction and lets your 4.2 V8 breathe.
The OEM system uses multiple catalytic converters, including pre-cats close to the engine that create early backpressure and reduce performance.
This setup replaces that entire section with a straight-through high-flow design.
Power Gains
- Up to 25+ horsepower
- Up to 35 lb-ft torque
- Faster throttle response
- Stronger midrange pull
Fitment
- Audi S4 B6 4.2 V8 (2004–2005)
- Audi S4 B7 4.2 V8 (2005.5–2008)
- Quattro models
- 6-speed manual
Key Features
- Full catless design
- Replaces 4 factory catalytic converters
- Improves exhaust flow
- Cost-effective performance upgrade
Install Notes
- Direct replacement design
- Professional install recommended
- Tune recommended for best results
- Off-road / race use only
Build Your System
Pair these with other upgrades:
Unlock the real power of your Audi 4.2 V8
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