New to the forum, but put PS4s on my 335d last week all around. Noticed the difference immediately from RFTs. Feels so much more comfortable, and noticeably more grip. Mine was also remapped...however the map mysteriously disappeared following a BMW dealer MOT (hence new tyres).
PS I Kept the rears (19”), as they have only done 10000miles, and looking to sell them, but haven’t yet got around to posting them.