Hello guys, would like to get some information on my leggy. i have an LS integra 99, it has now a b20b swap only the engine, all the other part are from its original motor b18, including the ecu p75 OBDII. I did some work on the a.c and the car just started to consume a lot of fuel after ac is working properly, other thing i don't know is, if the ecu i am using works just fine with the engine, i know its the same series but different cylinder capacity. Would like to know in case its not correct what ECU should i use and how i can test or improve the fuel consumption.

Regards guys!