Do you remember the tuning company, Hartge? The tuning specialists at Hartge are doing a great job when they the hands on the BMW models. Famous tuner, Hartge, has modified the BMW 135i with an ECU upgrade from 135i standard version with 306hp (3.0 liter engine inline 6-cylinder twin-turbo) up to 350 hp and a maximum torque of 354lb -ft. Because of this upgrade ECU, the car has a great 0-60mph acceleration of 4.8 seconds, with 5 seconds faster than the standard version of BMW 135i.
This change came from Hartge and is not contains only in the upgrade of engine, they added some elements to the exterior and interior.
I shared you some photos with BMW 135i tuned by Hartge below: