I thought this was koo, so would having a piggy back just be even more benficial?

Engine Management :Engine Control Module (ECM) manages fuel injection and ignition systems and features learning, self-diagnosis, limp-home and anti-knock capabilities

got it off subaru.com specs

let me know on your thoughts thanks

brandon-

 

most complete aftermarket systems have that stuff.

My Nemesis has all that. Limp home is called "backup spark map" and it has "auto tune" and "long term fuel trim learning" as well as knock protection and compensation.

I don't believe in piggy backs if you can afford standalone. However, lots of people have good luck with piggy back systems. I just think it's a pain to have a stock ecu learn around the piggy back and then you're constantly chasing your tune.

But that's my opinion

 

hey thats a valid thought never thought of it that way thanks