The links at the bottom of the page are to a pair of tunes that I evaluated on a DynoJet the same day using my B5 S4.
There is a Nefmoto K03 Stage 2 community tune that was the product of a community tuning effort as part of a training discussion.
There is also a more aggressive K03 Stage 2 tune, referred to as the Notorious VR Stage 2++ tune on Nefmoto.
A comparison of these two performance tunes, along with the stock Audi B5 S4 tune, are shown below.
![](https://myaudis4.com/wp-content/uploads/k03_boost_profiles.png)
The chart above is for the manifold boost pressure that each tune generates, the lowest being stock, middle the Nef tune, and highest boost generated by the NVR tune.
![K03 Tunes Compared](https://myaudis4.com/wp-content/uploads/k03_dyno_comp_map.png)
In the chart above is shown approximately where each tune operates on the BorgWarner K03 compressor map.
![K03 tune injector duty cycle](https://myaudis4.com/wp-content/uploads/k03_dyno_idc.jpg)
The IDC chart above is of the respective Injector Duty Cycles for each tune.
Below are the Uncorrected DynoJet numbers for wheel horsepower and wheel torque:
![K03 Tune Wheel Horsepower Compared](https://myaudis4.com/wp-content/uploads/k03_tune_whp_compared.jpg)
![K03 Tune Wheel Torque Compared](https://myaudis4.com/wp-content/uploads/k03_tune_wtq_compared.jpg)
The links below are to the binary files that I have loaded onto my B5 S4 and that were used during the dyno session.
There are no guarantees that your S4 will perform like mine if you use these tunes.