Re: Jap tires not suitable for BMW cars?
It all depends on what you do with your car and your driving style... e.g. hardcore tracking, occasional tracking, looking for comfort, wet handling etc etc.
There'll be a range in most any brand and I believe many bros here has lots of experience in tyres need. As for me I had tried Yoko ES100, Falken Azenis 512 and now Federal SS595 Racing. Found them alright for my needs except the Falken.. which I used only for 3 months.
They all are performing acceptably on dry and the Falken just didn't make it on the wet..so. The other 2 is more noisy with the Yoko loudest after about 2 months. I find Federal value for $$$ but some other bros find it noisy.
Table down your needs and expectation, In this way, you will probably get a better recommendation from the bros and sista here.