First it was the 335i that Car and Driver dynoed at nearly 350hp. Now it ‘s the 135i ‘s turn. Mwerks took their long-term press car down to the local dyno and got some impressive numbers: an estimate 329 hp and almost the same torque.

We ‘ve known for a long time that BMW has been under-representing the twin turbocharged inline six (or “the engine ” as it ‘s becoming known as) since it ‘s inception. Is it to create a clearer distinction between the M cars or is it simply about under-promising and over delivering? Our money is on the former.

One also has to wonder how much these aftermarket ECU tunes (Dinan etc) are actually worth it if the gain is truly only a few horsepower.

+ Dyno Chart / Mwerks