Why the factory did not
The factory considered most of this and declined, for reasons that were rarely aesthetic. Two guides on emissions certification, warranty exposure and the decade of durability testing a tuner does not spend.
A chassis dynamometer in an emissions cell — the test the factory has to pass and the tuner does not.
Photo: 005 Chassis dynamometer car testing in car factory - Opel Factory in Gliwice, Poland - Rollenprüfstand · Wikimedia Commons
Everything in this section
The other three sections