Downpipe with catalytic converter, heat shield + OPF for Mercedes-Benz A-Class (W177) A45/A45S — TA Technix
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Downpipe with catalytic converter, heat shield + OPF for Mercedes-Benz A-Class (W177) A45/A45S
Features
Technical details
- With heat shield and OPF
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 - it 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 up, and the power delivery 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 gain remains untapped.
What to plan for
- ECU remapping: essential to take advantage of the gain and avoid limp mode.
- Without a catalytic converter, the car is no longer road legal and the engine warning light will come on if nothing is done electronically.
- Check the sensor port: single or twin depending on the engine; this is specified in the technical details of the product page.
- Removal often requires access from underneath and removing an engine mount: plan on using a lift or axle stands.
Compatible vehicles
| Make | Model | Engine | Years |
|---|---|---|---|
| Mercedes-Benz | A-Class (W177) | AMG A45 + AMG A45S engine code M139 | — |
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