muffler packing

anyone notice a drop in power when there packing gets a bit old?? and at how many hours??

I think It gains more power.Sure sounds like it.:p

I´ve never noticed anything, it´s too subtle of a change, and it comes over time...

Then when I repack, I still think it´s exactly the same...

for power you wont miss much if its old but good packing makes back pressure and a large increase or no back pressure will reduce power as will to much back pressure. imo id repack after 25-30hrs.

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