The Saturn SL sedans arrive this model year boasting several major enhancements. The change of greatest significance involves vastly improved noise/vibration/harshness characteristics of the Saturn Power Module (engine). Many components are redesigned including a longer power metal connecting rods, a new eight-counterweight crankshaft, and a new piston design. The design changes result in reduced sound levels and improved engine smoothness. Other enhancements this year include a more convenient seatbelt design and an improved EPA fuel economy of one MPG on all models. SL models with a 5-speed transmission receive a two mpg improvements in the highway cycle. An anti-lock braking system (w/ traction control) remains optional.