Very interesting thing happened to me on the way to the bar... (and that's actually not the setup to a joke)
I own a set of 3 position end links, lower the bike 1", 2", or 3" in the back.
Being my first bike, and me only being 5'8", I initially installed the end link in the 2" lowered position, and moved my forks up the tree to lower the front roughly 1"... maybe 1.25" at most. I noticed that even with my shock set to the stiffest preload setting, it felt like having the shock on the 1 or 2 soft positions for preload with the bike at the stock height.
Being new, I haven't ever ridden with a passenger on the bike, but my girlfriend finally felt confident enough in me to jump on the back, and we rode to a local bar just a few miles away for a huge bike night that they do. I thought I felt a little extra vibration that made me slightly concerned but it seemed to smooth out while moving and didn't feel anything while stopped.
A couple days later, I look at my rear tire, and see that the side-most row of knobbies on my rear tire (it's a knobby rear tire) looks like the surface has been melted, with a little ribbon of rubber particles trailing each knob on the tire.
I presume that with the bike in the 2" lowered position, with the weight of both of us on it, it sank the rear enough that the FMF pipe was touching the tire! Neither of us is heavy - I'm 175, she's probably 110 - but collectively with the lowering, that was enough. It must have been JUST touching, because it was barely noticeable.
I could care less about the tire damage...
a) it's just the surface of the knobs on the knobby, tire is technically still fine
b) I bought a set of replacement tires a while back because I don't need/like knobbies and just hadn't gotten around to installing them yet
...but thought this might be worth mentioning if someone was considering lowering their bike.
Since I feel more confident on the bike (and was planning on it anyway), I've since raised the link to the 1" lowered position to match my front lowering, and also notice the shock adjustment is more usable now... and my headlight isn't blinding everyone anymore. I don't think it'll rub in this position, but can't imagine how anyone could even use the 3" lowering position!
Has anyone else experienced this with lowering links?
Is it that my FMF pipe is that much wider than the stock muffler? I have the stock muffler, but bought the bike with the FMF already installed.