BMW gives its 1 Series the "s" treatment, raising the engine output, tightening the suspension, and giving it an excellent exhaust note.
BMW's 1 Series sits at the bottom of the model lineup, but it can be one of the best cars for the driving purist. For the new 135is model, BMW upgraded the engine software, giving it higher output, and made other performance modifications.
The engine consistently wins awards. It is based on a 3-liter inline six-cylinder block, and uses direct injection and variable valve timing for fuel delivery. A twin-scroll turbocharger helps boost output.