I'm not sure if this is possible with a Factory EMS cause i never had one on this particular engine. If u find a mechanic that can do it for you , he should know if its possible. whatever you do don't just slap it on by yourself and hope it works. It just might do more harm than good. have you done your gasket and put in arp head studs yet? i had mine done by a friend who tunes hi performance turbo cars for a living. it does make the car go hard thou when done right. You'll have a smile on your face for a month. till u get used to it ,then you'll want more.
hope it helps!