I need to replace my ECM. P/N is A56P33Z44. is the replacement need to be exact p/n? Does the last 3 digit matter? I could get ones from Ebay with matching first 6 digits, the last 3 though are not matching, I would then send this to Nisformance for NATS delete. 5Speed.

 

I'm guessing it would have to be an exact match aside from manual and automatic I believe there are Cali and Fed spec models..... send an email to Nisformance and see what they say...