Hi, I have an engine noise, when I rev my car, on the way back down, there is a slight rumble noise, just come on this month, currently at an audi specialist, leak test, no issues, pressure test, no issues, boost test, no issues. Next is to strip injectors, clean and Check seals. I know there is a process, how ever, has anyone else had this issues, seems to be around the intake manifold area.

2015 audi a6 c7