The Stage#2 AFR Mapping (Air Fuel Ratio) with original BMW file (not the custom tuning) will map of balancing Air/Fuel Ratio in perfection mixed according to BMW calculation for Full System Exhaust. We don't need to worry about it too lean or too rich as per as BMW standard file.

What improves 🔥🔥🔥

✅1. Immediately 4~5 horse power increases at engine.🐎🐎🐎🐎🐎

✅2. No jurking at low RPM

✅3. The Throttle responding balance and accurate with faster acceleration.

✅4. Higher RPM is excellent responses.

✅5. Reduce the engine temperature 🌡️

Hardware Requires: (Customer responses)

1. Replace the stock header to full system titanium exhaust

2. Replace the stock air filter to Hi-Flow Air Filter

3. Install the Servo Buddy to remove engine error (or in euro 6 maybe need Brent tuning or some 3rd party tuning software that can close the error too)