The first-generation 9-5 is powered by Saab's B205 and B235 straight-4 engines, and from 2002 in Europe by an Opel Ecotec X22DTH 2.2 diesel engine (Saab D223L), replaced in 2006 by Fiat's 1.9 JTD 16V diesel straight-4. A turbocharged version of the GM 54° V6 engine, designated by Saab as B308, has a unique asymmetrical low-pressure turbocharger and was available from 1999 to 2003. This engine is available only with an automatic transmission, and cars with this engine installed are distinguishable by their twin tailpipes. The V6 is only available on Arc, SE, and Griffin models. In 2004, the V6 engine was replaced by a high pressure turbo straight-4 engine producing . By 2006 this engine was producing even in the non-Aero or non-sport models (US models).