I want to say at least 2 years? Cant tell if there’s been any burnout, they use more of a loose and fluffy long strand Fiberglas packing iirc. They have gotten slightly louder, but not blown out loud. Still sound the same for some time now. The welds and finish are still holding up. They are 6” diameter, you probably won’t be able to fit something that big would you?
I'll probably going to need some s bend extensions that tuck them up in the former crossmember area. Those little Schoenfelds i have on it now I think are 6, but they are also only like 8 inches long.
