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Old 03-21-2023, 01:27 PM   #1
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Onan LP2500 gen add tractor muffler?

I have a Cummins Onan Generator, HGJBB (SpecA), RVQG2500LP2.5HGJBB-1121.

It has a muffler built into the housing. However it is very noisy. Can I add a small tractor muffler to the tailpipe? Would the back pressure kill the generator? Any see any problems?

Muffler: Walker Exhaust Quiet-Flow 22229 Direct Fit Exhaust Muffler
found on Amazon at
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Old 03-21-2023, 06:25 PM   #2
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I think Onan markets this as an add-on muffler.
George Schweikle Lexington, KY
2005 Safari (Monaco)Trek 28RB2, Workhorse W20, 8.1, Allison 1000 5 spd, UltraPower engine & tranny, Track bars & sway bars, KONI FSD, FMCA 190830, Safari Int'l. chapter. 1999 Safari Trek 2830, 1995 Safari Trek 2430, 1983 Winnebago Chieftain, 1976 Midas Mini
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Old 03-22-2023, 07:15 AM   #3
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Thank you for responding George. That is a resonator, not a muffler. It does change the sound but it does not reduce the volume, which is what a muffler does. I have that ready to be put on, but then came across an actual small tractor muffler and bought that also. I am wondering if the back pressure may be too much for the Onan. A new Onan LP2500i (inverter type) costs about $4K. Would much prefer not to have to replace it.
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Old 03-25-2023, 02:59 PM   #4
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I returned the muffler and probably won't even install the resonator. I don't want to take a chance on messing up the generator.
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