So I checked the flange bolts and everything seems to be tightened.....I had my GF rev the car while I tried to listen to see where the flapping noise is coming from, and it's coming from my exhaust(the actual mufflers). Funny I never really heard that and I've had my exhaust for about a year or so lol.....
As for the PS, I cranked the wheel from lock to lock a few times and left the car on for a few seconds before turning it off, per DIY guide for PS flush, and it seemed a bit better. I'll have to keep an ear out for the noise and report back.....I really hope it's not the active steering rack or the column.....fingers crossed!
'08 AW E90 335i
PROcede V5 | BMS DCI | RR DPs | ETS FMIC | FORGE DVs | Stett CP | Vanguard | PSS10