Is a pretty basic formula in the automotive industry.
Take your smallest and lightest model, place the most powerful engine in it you have that will fit, add brakes, suspension and steering to match and you’ve got yourself a new high performance model.
In this case, the model is the BMW 1 Series Coupe and the engine is twin-scroll turbocharged inline six. The result is the 2013 BMW 135is, out and out fun, as well as a bit of an apology. The apology comes because there was at time when the 135is would have been the second most capable 1 Series model because the BMW 1 Series M Coupe was still in existence.
An absolutely delightful car, the 1 M Coupe had an aggressive bulldog stance, a 335-horsepower twin-turbo inline six cylinder engine capable of generating up to 369 ft-lbs of torque and weighed just over 3400 pounds. If that sounds like a prescription for some serious quickness it was.
It was also rare.
BMW only produced the model for one year.
So, in a seeming gesture of appeasement, we get the 135is. While it gives up 15 horsepower and 62 ft-lbs of torque to the 1 M, it gains 20 horsepower and 17 ft-lbs on the 135i, and the 335i. So basically, what you have in the 135is is a car that will surprise your average 3 Series driver should they ever deign to look down their nose at you at a traffic signal. When the light changes, you can leave them in your dust.