The "350HP" is the next step up the ladder to more performance out of your 4.0 based Jeep/AMC motor. This combo features a more aggressive cam profile to give that "Lopey/Rowdy" idle
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Amazon.com: AUTOSAVER88 Catalytic Converter Compatible with 1996-2000 Jeep Cherokee 2.5L/4.0L | 1996-1998 Grand Cherokee 4.0L/5.2L | 1998 Grand Cherokee 5.9L Direct-Fit (EPA Compliant) : Automotive