Each successive generation of BMW's iconic 3-Series has grown in size and price, leaving the door open for a new entry-level model. BMW has introduced the 1-Series coupe and convertible to fill that opening. When compared to the 3-Series, the 1-Series is about 9 inches shorter, 2 inches narrower and a couple hundred pounds lighter. The good news is that the same two six cylinder engines power the smaller car. A 230-bhp inline-six resides in the 128i, whereas a 300-bhp turbocharged version powers the 135i. A smaller car with the same power could make the choice between the two tough for prospective BMW buyers. Although the starting price is low, options and packages can add thousands to the price.

The 1-Series adds 135is models to the lineup. The turbocharged inline-six in the 135is has increased power and torque. The 135is is further differentiated with a different exhaust, unique wheels and a high-gloss grille.