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Turner Performance Software for E9X 328i (SULEV)

Save $100 on DIY flash tunes - only for 100 hours! Now through 5/14.
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Product Details

Max HP gain = 15 hp
Max Trq gain = 12 ft-lbs
Rev Limit = 7000 RPM

Our software fully maximizes the N51 engine in the 328i while in SULEV spec (Super Ultra Low Emission Vehicle). The stock BMW software is hampered by settings for 87 octane fuel. By re-mapping the engine programming for 91 octane, we can make more power, torque, and improve fuel mileage - all without harm to the engine or affecting driveability. We have paid particular attention to increasing low and mid-range torque. The throttle response is also improved (quicker) eliminating unwanted and dangerous flat spots in the pedal response.

This software file is for the N51 engine SULEV model only. SULEV is a specification used in some parts of the US where emissions compliance is critical (mostly in California, the Northwest, and the Northeast). The computer and engine specs are different than the 'regular' 328i N52 engine.

There are two ways to install our software: mailing the ECU to us for a reflash or do-it-yourself install with our Turner Flash tool:

Mail-In Reflash - lower upfront cost but additional shipping charges. Minimum downtime of at least three days. We have a 24 hour turnaround on shipping the ECU back to you but factor in transit time. Expert installation of your software at our facility.
Turner Flash DIY tool - higher upfront cost but files are emailed back and forth. No downtime - you can still drive the car while we process your tune. Files are emailed back and forth - your stock file comes to us, a tuned file is returned to you. Easy install via Windows laptop using these instructions (click here).

Should you choose to mail your ECU to us, follow these specific instructions on shipping the computer (click here). We will provide you a free Next Day Air shipping label to get your ECU to us quickly - and returned just as fast. We will contact you to arrange a time to ship in your ECU to further minimize downtime.

This item fits the following BMWs:
2007+ E90 BMW 328i 328xi 328i xDrive - with N51 SULEV engine - Sedan
2007+ E91 BMW 328i 328xi 328i xDrive - with N51 SULEV engine - Wagon
2007+ E92 BMW 328i 328xi 328i xDrive - with N51 SULEV engine - Coupe
2007+ E93 BMW 328i - with N51 SULEV engine - Convertible

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Kit Configurator

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This Part Fits the Following BMWs

Make Model Submodel Engine
BMW E90 328i N52 3.0L
BMW E90 328xi N52 3.0L
BMW E91 328i N52 3.0L
BMW E91 328xi N52 3.0L
BMW E92 328i N52 3.0L
BMW E92 328xi N52 3.0L
BMW E93 328i N52 3.0L
*The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.
  • 22 years of BMW Tuning.
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