[Phizinza]

I have a 99 BH Outback, 2.5l MT NA.
Wondering if there is any newer ECU (32bit flashable?) that would plug right in and work? Or did too much change before the 32bit ECUs came out?

 

[cardoc]

I believe if you want to change the fuel management, or other system, you will need a stand alone aftermarket programmable system or a "piggy back" to tie in with the stock ECM.

This is the home page of a guy in San Antonio, Tx who installed a M62 SC from a Mercedes onto a 2.5: 2000 Subaru Impreza 2.5RSC Build Part 1 - Ludicrous-Speed

This is the page where he post what he did for management: 2000 Subaru Impreza 2.5RSC Build Part 5 - Ludicrous-Speed