Nearing the end of 2018 and BMW finally makes an I4 with just over 300 hp, what’s taken them? Seriously, with Audi packing 292 hp into the S3 and M-B cramming 375 hp into the AMG CLA45, it’s about bloody time. Even Mini, which has been BMW’s I4 based hot hatch brand since they acquired them, has never made more than…