Downpipe without catalytic converter for Audi A4-RS4, A5-RS5 type B9 — TA Technix
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Catalyst-free downpipe for Audi A4-RS4, A5-RS5 type B9
Features
What this part changes
The downpipe is the pipe that runs down from the turbocharger. This is where backpressure builds up: the turbine has to push the exhaust gases through a narrowed section and often a catalytic converter. Widening it frees up the turbine, allowing it to build boost earlier and more decisively - this is the exhaust modification you feel the most on a turbocharged engine.
What changes behind the wheel: response. The turbo takes less time to spool up, and the power holds higher in the rev range. On a remapped engine, this is the part that allows the ECU tune to deliver what it promises; without remapping, the ECU compensates and most of the gain remains untapped.
What to plan for
- ECU remapping: essential to take advantage of the gain and avoid entering limp mode.
- Without a catalytic converter, the car is no longer road-legal, and the engine warning light will come on if no electronic adjustments are made.
- Check the sensor port: single or dual depending on the engine; this is specified in the technical details of the product page.
- Removal often requires access from underneath and removal of an engine mount: plan for a lift or axle stands.
Compatible vehicles
| Make | Model | Engine | Years |
|---|---|---|---|
| Audi | A4 Avant-RS4 Quattro type B9 | — | — |
| Audi | A5-RS5 Quattro type B9 | — | — |
Delivery & warranty
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