Taken from Wikipedia :
In 1993, Chrysler Corporation released the next member of the Magnum family: the 5.9L V8. This was based on the LA-series 360ci engine, and included the same upgrades and design features as the 5.2L. The standard 5.9L created 230*hp (170*kW) @ 4,000 rpm and 330*lb·ft (449 N·m) @ 3,250 rpm. It was upgraded in 1998 to 245*hp (183*kW) @ 4,000 rpm and 335*ft·lbs (454 N·m) @ 3,250 rpm. However, Chrysler came out with the performance-oriented R/T version in 1998. This engine was provided with a more aggressive camshaft profile, and it was rated for 250*hp (190*kW) and 345*lb·ft (469 N·m). The 5.9L R/T came factory-installed in 1998-2001 Dodge Dakota R/T pickups and Dodge Durango R/T SUVs. It was also installed in the Jeep Grand Cherokee Limited 5.9, only available in 1998. The 5.9L Magnum was available until the 2003 model year, when it was replaced with the 5.7L Hemi V8 engine.