I installed the same resonator on the earlier non-inverter model of the Onan 2500LP (runs at a constant 3600 rpm). The exhaust on mine has a "poot-poot" sound that was annoying, and after installing the resonator, the volume of the sound was not appreciably reduced, but the TONE was changed, and the "poot-poot" sound was pretty much gone.
Installing it on the new inverter model Onan 2500i probably has less effect as the engine generally runs slower (2445-2900 rpm) and never gets close to the 3600 that a non-inverter generator runs at.
Here is a video that I did showing the difference on my trailer. YT messed me up by converting it to a "short" so all of the description of what it is and why is not visible to the viewer unless they click the three vertical dots in the upper RH corner and select "description". I will have to eventually edit the video to longer than a minute by adding some BS at the beginning and end but for now you are stuck with looking at a 40 second short.
https://youtube.com/shorts/NQEtWhQr8ps?feature=shareI have since cut out a section of the pipe under the trailer and welded the resonator in place.
Charles
