Win this M240i!
Every $50 spent = 1 entry*

No purchase necessary to enter or win. See official rules.

Win this M240i!
Every $50 spent = 1 entry*

No purchase necessary to enter or win. See official rules.

The above image is for illustrative purposes only.
Select options below.

Turner N52 Performance Software

High performance street tune without compromise - featuring the Turner Flash DIY tool for easily tuning your BMW in your driveway or garage. Gains of 19hp/19ft-lbs (or much more with a manifold upgrade!)
Turner Motorsport
Select Your Vehicle

Turner N52 Performance Software

Starting at: $396.71 633.34
Sale Save 18%
Free Shipping Free Shipping
Availability: In Stock
Add to Wish List

Select Options

all options
Turner Stage 2 Performance Software For E90 325i/xi, E60 525i/xi
For vehciles with 330i manifold
3184728 TN52-325-ST2
In Stock
Sale SAVE 25% $528.96
Mail-In reflash (I will ship my ECU).
Ideal if you can be without a car for 72 hours; lower cost than the DIY flashing tool.

Product Details

Reliability and low cost of ownership are two great reasons to own a 325i over its higher-powered siblings - the 335i and M3; although no slouch, power is not one the N52's strong suits. How about changing that?

Years of experience building and racing E90 328i cars taught Turner Motorsport more than a thing or two about tuning the N52. Consistently one of the fastest cars in the pack, Turner's Grand-Am KONI Challenge 328i was dialed in for power and reliability. Combine this racing experience with years of operating a service shop, Will Turner's team knows the importance of delivering an all-around improved driving experience. More than just a simple pedal remap or mixture adjustment, the Turner N52 tune has been street and dyno-optimized to deliver such an experience to put a smile on your face. You will not be disappointed.

What does Turner change in my car's ECU? While much of Turner's performance software is proprietary and under wraps, they do change:

  • Mapping for fuel, ignition, VANOS, camshaft timing for improved power and torque, with special attention paid to low end torque. This results in a more real-world useable powerband that is more enjoyable in traffic.
  • Mapping for pedal input, throttle response, and torque limiters. This results in crisper engine feedback from hitting the gas, and smoother power delivery.
  • Significant improvements for cars upgrading to the 3 stage manifold to capitalize on dual DISA valves, resulting in power output superior to that of the E90 330i, all while retaining all factory emissions controls.

Expect crank power gains up to 19hp, 19ft-lbs of torque, with 30hp or more for cars upgrading to the 3 stage manifold. More on the 3 stage manifold:

Found on the E90 330i, Z4 3.0Si, and X3 3.0Si, the high output N52B30H0 engine's intake manifold is a bolt-on upgrade for the E9X 325i. Using dual DISA valves, the 3 stage manifold better manages intake air volume to the cylinders that need it most - resulting in better power and torque. If you are familiar with the M50 manifold upgrade for E36 models, this is similar, although requires no adapters, cutting, splicing, or other modifications. Using all bolt-on parts, you can upgrade to the higher performance E90 330i intake manifold. 

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.

Either method you chose, we will be in touch with you for specifics on your vehicle and desired tune. 

This Part Fits the Following Vehicles

Make Model Submodel Engine
BMW E60 525i N52 3.0L
BMW E60 525xi N52 3.0L
BMW E90 325i N52 3.0L
BMW E90 325xi N52 3.0L
BMW E91 325xi N52 3.0L
*The above product applications have been written by ECS Tuning. All warranties, product application, fitment, and performance are the responsibility of ECS Tuning. For additional information see the terms of use.


ECS Tuning is not affiliated with any automobile manufacturers.
Manufacturer names and/or part numbers are used only for identification purposes.

Terms of Use Privacy Policy ECS Tuning is part of Enthusiast Auto Holdings