Irmscher - this name is forever associated with Opel among car enthusiasts. No other company has been continuously and successfully tuning everything that bears a lightning bolt in its logo for so long. In the early 1960s, Günther Irmscher began "tuning" - as it was still called back then. Initially, it involved vehicles from NSU. In 1968, the company was founded, and soon after, Opel's covert involvement in rallies and races emerged, with Günther Irmscher as the motorsport mastermind of the German GM subsidiary. It was an exciting time. Heroes like Walter Röhrl won thanks in part to Irmscher's innovations on Opel. Today, Irmscher is a globally operating partner in the automotive world, developing special models for many manufacturers and has also emerged as a producer of sports cars and even electric vehicles. This book, created in close collaboration with Günther Irmscher Jr., presents for the first time the complete history from the roots of the company founder to the present day - featuring many previously unseen photos.