I have a 2016 mustang ecoboost automatic. I already had a mbrp race series cat back exhaust system installed. I just recently installed a SR performance cold air intake and Boomba Bov adapter. Other than that the car is stock. No tune, no downpipe, nothing else. If I'm in regular drive mode and I get on the gas, as soon as the boost gauges hits about 15 psi, it starts to flutter and it sounds like the exhaust is back firing. The car used to get to almost 23 psi before the upgrade. I only have pretty basic car knowledge, so any help I can get would be appreciated!