BMW 3 Series E9x

BMW 3 Series E9x

335i - N54 306HP Petrol · Petrol · 306hp / 400Nm stock

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Tuning figures

Power & torque gains

Stage 1
Max gain Up to +90hp
Power up to +90hp
Torque up to +140Nm
306hp stock Up to 396hp
+57 to +90hp gain range 363-396hp tuned range
400Nm stock Up to 540Nm
+90 to +140Nm torque range 490-540Nm tuned range
Stage 2
Max gain Up to +118hp
Power up to +118hp
Torque up to +168Nm
306hp stock Up to 424hp
+75 to +118hp gain range 381-424hp tuned range
400Nm stock Up to 568Nm
+108 to +168Nm torque range 508-568Nm tuned range
Why this is shown as a range

Because every car is different and our tuning is truly custom to the vehicle, output power after any form of tuning does vary between vehicles. Anyone saying it will be a fixed X hp after a tune is clearly applying an off-the-shelf map.

Stage options

Choose the right tuning package

Each stage is matched to the selected engine, its health, and the hardware fitted. The aim is useful, reliable performance rather than an off-the-shelf number.

Stage 1

Healthy standard car remap

The sensible first step for a standard vehicle in good condition. Built for stronger response, better drivability, and safe everyday performance.

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Power gain +57 to +90hp
Torque gain +90 to +140Nm
  • Custom calibration for the selected powertrain.
  • Dyno-developed mapping with road manners kept intact.
  • Safe for a healthy standard car with no hardware changes required.
  • Includes checks, support, and a 2 year warranty.
Stage 2

Hardware-supported custom calibration

For cars with supporting modifications such as intercooler, intake, fuelling, or sensor upgrades. We tune around the actual hardware fitted.

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Create an account or log in and we will keep this vehicle in My Garage with its exact tuning package pricing.

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Power gain +75 to +118hp
Torque gain +108 to +168Nm
  • Best when hardware changes need calibrating properly.
  • Bring a clear list of fitted parts before we quote or book.
  • Health checks are recommended if the car was bought already modified.
  • Can include Stage 1 features plus hardware-specific tuning.
Additional tuning options We have a number of additional tuning options available alongside Stage 1, Stage 1+ and Stage 2. Suitability depends on the vehicle, hardware, and intended use.
  • Sensor, limiter and driveability changes where supported
  • Emissions or motorsport-only software work where suitable
  • Hardware calibration for intake, exhaust, cooling and fuelling upgrades
Stage 3 and above

Custom tuning for serious hardware

We offer tuning for most performance modifications, from larger turbos and hybrid turbos through to cams, injectors, fuelling upgrades, ECU changes, sensors, and built engines.

Session type Custom Quoted after reviewing the vehicle and parts list
  • Larger turbos, hybrid turbos, supercharger changes, and boost control upgrades.
  • Camshafts, injectors, fuel pumps, MAP sensors, intake, exhaust, and charge-cooling changes.
  • Standalone ECUs, ECU swaps, built engines, and unusual conversion work.
  • Best handled with a clear parts list, intended use, fuel type, and current vehicle condition.
More information about Stage 3+
Included with tuning work Installation, checks, support, and calibration matched to the selected vehicle. Any mechanical issue found is reported clearly before extra work is carried out.
Before major hardware tuning We need to understand the parts fitted, the condition of the car, the ECU or management system, fuel type, and how the vehicle will be used.