31/05/2026
BMW F31 335xd (2014) — 403.5hp With The DPF Still Intact
A lot of people will tell you that 400hp+ on a 335d means removing emissions equipment.
This car proves otherwise.
📈 Independently tested at Surrey Rolling Road, producing:
🔺 403.5hp
All while retaining a fully functional DPF system.
Modifications are straightforward and sensible:
✅ Intercooler upgrade
✅ Engine calibration
✅ Transmission calibration
✅ EGR optimisation
✅ Swirl flap optimisation
✅ DPF retained and fully operational
No smoke maps.
No disabled DPF strategies.
No shortcuts.
Just a properly calibrated setup designed to make reliable power while retaining the systems BMW engineered into the vehicle.
One thing often overlooked is that a healthy DPF is not the restriction many people assume it is. When the engine, turbochargers, sensors and calibration are all working together correctly, there is still plenty of performance available without removing it.
This result was achieved with the DPF remaining in place and functioning exactly as intended.
Independent dyno figures are always nice to see because they remove any doubt and provide a completely unbiased result.
403.5hp.
DPF retained.
Verified independently.
Real calibration.
Real protection.
Real results.
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