Originally Posted by pruettfan
You might want to get the car to the dealer. With the independent rear suspension in the E90 if you are getting noise and a smell I would guess that the increased torque and HP from DS mode may be exposing an issue that does not come up in normal mode.
No stop scaring him.
Bilstein B8 Euro-spec struts, Bilstein B8 shocks, eibach pro-kit springs, Remus exhaust, stage 3 intake manifold,Stage 2 AA tune, BMW Short shift kit. Silicon intake pipe. M3 control arms front, M3 rear. ECS trailing arm with whiteline bushings. Purple powerflex subframe bushings. Yellow power flex upper shock mounts. Single mass flywheel OE weight.