Catless downpipe with flex section for BMW 5 Series F10, 6 Series F06 - 550i/650i - engine code N63 — TA Technix
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Catalytic converter-free downpipe with flex section for BMW 5 Series F10, 6 Series F06 - 550i/650i - engine code N63
Features
Technical details
- 76 mm downpipe, 2-piece kit
- With either 2 lambda sensor ports
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 expel exhaust gases through a restricted 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 notice most on a turbocharged engine.
What changes behind the wheel: 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 tune to deliver what it 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 sensor port configuration: single or dual depending on the engine, as specified in the technical details.
- Removal often requires access from underneath and removing an engine mount: plan on using a lift or jack stands.
Compatible vehicles
| Make | Model | Engine | Years |
|---|---|---|---|
| BMW | 5 Series LCI, type F10/F11 | 550i - V8 - engine code N63 B44B | 2013–2017 |
| BMW | 6 Series Gran Coupé, type F06 | 650i - V8 - engine code N63 B44B | 2012–2017 |
Delivery & warranty
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