Why would you bother? I genuinely don't understand why you wouldn't use the M-box.
Hey Guys we were testing a car we figured out the TPS was being wonky, we thought it might have been an ECU due to the codes we were seeing so we tried and it Ran but as soon as we gave it some throttle it started burningup the solder and burned a trace, we traced it to pins 36/38 now the T-Box is fried but the original M box runs fine...some we are perplexed after checking Elsa and the S4 ECU pinout pdf I found on here.
Which is weird because it ran fine in my 02 APB S4. A friend and I both verified the PCB, version 3.3 T vs 1.3 on the Mbox but everything on the board was the same. No short in the Harness, only thing we can think of is the ECU must have had a short. Looking at other designs I don't see VAG changing anything much other than emissions related stuff.