Downpipe for Subaru Impreza GC/8 + WRX — TA Technix
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Downpipe for Subaru Impreza GC/8 + WRX
Features
Technical details
- 2.5"/69.5mm downpipe, with lambda sensor connection
What this part changes
The downpipe is the tube that runs down from the turbocharger. This is where back pressure builds up: the turbine has to push the exhaust gases through a narrowed section and often a catalytic converter. Enlarging it frees up the turbine, allowing it to build boost earlier and more decisively - this is the exhaust modification you feel most on a turbocharged engine.
What changes behind the wheel is the response. The turbo takes less time to spool and the boost holds higher in the rev range. On a remapped engine, this is the part that allows the ECU to deliver what the tune promises; without remapping, the ECU compensates and much of the potential gain remains unused.
What to plan for
- ECU remapping: essential to make the most of the gain and prevent 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 lambda sensor connection: single or double depending on the engine, as indicated in the product sheet's technical details.
- 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 |
|---|---|---|---|
| Subaru | Impreza type GC8 | 2.0l Turbo GT · engine code: EJ20 / EJ205 | 1994–2000 / 2001–2003 |
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