Few mechanics recommended to install this speicially manufacturer for E60 aftermarket Plug & Play electronic component Size: small like macthes boxInstallation method : somewhere near the acceleration pedalCost : around RM 1,500Result : Instant performance increase (example: drive 520 but feel power like 525 or may be 530)I search thru forum but couldn't find this related matter.feel wanna try out but worry :afraid:about the side effect.any taiko / sifu outhere can advise? million thanks