Hartge gives the BMW 135i 350-hp, top speed of 174 mph
The first time Hartge got its hands on the BMW 1-Series, it didn’t bother giving it any performance upgrade. Well, now Hartge is back with the 135 Coupe and it’s a whole different story this time around. With the help of some ECU calibration Hartge extracted an additional 44 horses from the 3.0L inline 6-clyinder twin-turbo [...]
