Ryan02Stang said:
Ever figure this issue out?
I'm having a similar issue with my 2012 MKS. I noticed it feeling slower, so hooked up my boost gauge. I'm hitting a max of 11psi with a 3 bar tune installed, 2 bar tune installed, and returned to stock. I don't hear any weird noises, but it seems something is holding me at 11psi. No codes and car is operating completely normal, other than feeling slow.
What IAT Temps are you seeing! It should not exceed 150-F IIRC!
Check the CAC(Intercooler) for any debris & obstructed air-flow.
Try cleaning the MAP & IAT Sensors with some Mass-air-flow cleaner to see if it helps any!
I guess you can always perform a PCM Reset! Z
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