Insurance for a standard car and they say its a high performance

I asked them for a qoute on a new car i would like to ad on because my other car is insured with them. It's a normal bmw 320i f30 3 series so it a plain car and it's a not modified. The told me they can insure it because its a high performance car and im under 25 but it its a normal entry level and it not a m performance. So i will get a other insurer and there is insurances that will help me