Factory eco injection.

Killer6 said
That wasn't RRR, but He used that avatar for a little while, lol. The only low-buck tuning that Buick GN guys & FWD Mopar guys used is adjustable fuel pressure regs & injector selection.

I did that same thing lol. I read it and thought "he knows better!"

I would throw a sniper on it and be done IMO. Factory lack of tunability and serviceability isn't worth the hassle.