7 0 2004 Cummins ISX 450ST Exhaust Manifold for a Peterbilt 378 Newly Listed $199.95 USD Genuine Cummins ISX 3 Piece Exhaust Manifold, Take off 2004 Peterbilt 378 with a Cummins ISX 450ST Engine, Casting #'s : 3682348 / 3682549 / 36872491 ConditionUsedFits To Make(s)PETERBILTFits To Model(s)378Stock Number16055 MLS Number14027808CategoryExhaust Manifolds Last Updated12/11/2025 LocationSpokane Valley, WA, US Sold ByHigh Mountain Horsepower (833) 913-___ SHOWNUMBERCall Seller Email Seller Save More Info