Onan Generator - Muffler Replacement '98 30ft IB March 04, 2010, 07:14:48 am Yahoo Message Number: 110743Here is the reference info I sent to Todd at Lazy Daze: We found a muffler thru the phone number you gave us--1-800-888-6626---Cummins/Onan NE. For reference their part number is 155-2086 for the Onan 4000 generator(4.0 BGE FA/26100P) on the '98 30' IB we have. The tail pipe and hanger we got from you worked fine.