APR stage 3 tuned ECU for use with K04 based Stage III setups. This ECU is an H-box, so it is interchangeable with other B5 S4 MT cars.

I have the APE files and APR home programmer so I can load whatever code you want:

Stock, 91, 93, 100, 104, Valet settings available. Also has the Anti-theft, security lockout, throttle body adaptation and fault code erase.

I've also got an APE file for an APR tuned 93 octane water injection setting which runs more boost and leaner air/fuel ratio than the standard APR Stg3 software available elsewhere.

With the APR home programmer you could choose to run various combinations of this programming when you wanted.