You could try phoning Freightliner help line , but without serial number you might not get too far.
1-800-385-4357
Past the muffler , I believe Cummins would be 4" tail pipe, where Cat uses larger.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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