Are there any issues with running a P28 with the S300? From what I have seen there are just fewer outputs, but would a calibration for the P72 (I think?) ECU work fine in the P28?
Im running a P72 calibration with my S300 on a P30 ecu and tuning from that, its a bit rich to start with ive found [for my setup], ive just discovered the auto tune function today going to see how that works out, and hopefully save a bit of fuel at the same time