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Read that page it automatically goes to. If you notice they used two different types of PCMs in 1998, 1998.5 being the changing point for both the 24valve diesel and the Magnum PCMs. That's why many tuners don't support pre 1998 Magnums as they use a different computer. That's also why there is no performance Mopar PCM for the Magnum V8s after 1997 (until the Hemi replaced the Magnum).