One of the most contentious subjects in the Porsche world is the intermediate shaft (IMS) bearing used in water-cooled 911s and Boxsters and Caymans from model years 1997 to 2008. So when our test drive and inspection videos of a 986 Boxster and 996 Carrera collectively achieved nearly 50,000 views, we decided to follow up with an in-depth series to dispel myths surrounding the problematic IMS bearing these Porsches were equipped with from the factory. The 26-minute video above is the first and explains what an IMS assembly is, where it resides in the engine, and how it changed through the years. Enjoy!