Original article The most powerful 1-series diesel, the E81 123d (with 204bhp), has been handed to the Milltek technicians to work their magic and produce a truly spectacular performance exhaust system. Modern diesel cars have proven very responsive to the fitment of Milltek's exhaust systems - especially in combination with a remap and we expect the 123d to be no exception.
The car will not leave our workshop until all those criteria have been met!