As far as the 1 series f20/21 petrol models go you have the following choice depending on where you live.
114i, 116i and 118i are all 1.6litre twin scroll turbo 4 cylinder with 102, 136 or 170ps. Only differences are software and one piece of exhaust.
125i is 2.0litre twin scroll turbo 4 cylinder with 215ps
135i is 3.0litre twin scroll turbo 6 cylinder with 320ps