F30 / F31 / F32 / F33 / F34 / F36 (2012 - current)
need some advice. so i had a motor works shop install a vrsf downpipe in my F36 N20 last week tuned with dinan and BM3. I've been driving it for almost a full week and starting to have buyers remorse. the rattling and vibrations are giving me headaches, especially when idling at the traffic...