There may be a few exceptions to this (I recall coming across some allroad files that should've been APB based on model year but had the 4Z7 prefix), but generally the 4B0 ECUs are APB engines and 4Z7 ECUs are BEL engines. There are (minor) hardware differences between the two engine types, but the APB S4s had ~260HP which would lead me to believe the difference is mainly tuning based.
Thanks. So if the hardware is essentially the same, seems to me you could apply a factory stock 260HP .bin to a 230HP car and have a factory STAGE 1 tune. Thinking the TIP A6 LBox (stock) might be a candidate. Just thinking this could work if I don't cross the APB/BEL boundary.
Thank you.
Illbay