New to the forum, and found this post. I've been experimenting with my 18 regal. so, the regal is pretty much the same as the 2016+ ltg malibu .
-I've ordered the zzp 16+ malibu catless o2 housing, which should be a direct fit, which i will confirm when i receive it. i have found no exhaust options, but the stock main pipe is 2.5" and the y-pipe in the rear is 2.25, which should be able to flow well enough for a reasonably high power level if resonator is removed and mufflers are changed/deleted ( testing exhaust sound with the center pipe unbolted and hanging, the exhaust really wasn't too loud or obnoxious).
-The 2016+malibu k&n or aem
intake should bolt right up, and both have heat shields sealed against the hood, which i will confirm with the k&n soon. I know the stock airbox should flow adequately, but i've never seen filter issues with k&n other than when people don't clean or oil the properly.
-I've already installed the jacfab boost-o-lator which is a plunger modification for the stock bypass valve. very easy install with a 1/4 inch u-joint and ball head allen. didn't really feel a difference, as i doubt my butt-dyno accuracy.
-There are a few companies that offer turbo upgrades for the ltg, which should work the same in the 18+ ltg engines also, other than a lack of tuning options as of yet.
- I've also ordered a tune/tuner from IPF tuning which i will confirm if it works or not when I receive it. I contacted them and they claim it works for the 18 regal 2.0, and claimed they can do options such as deleting p0420 dtc or disabling start/stop system.
I'm hoping this all works out well, but being a gm tech, i'm sure i can rectify the situation if an issue arises with these
mods.