Went to look at my paperwork and it seems I was mislead.
Just got off the phone with the distributor I bought them from and he says "Bilstein 5160's are only a 90 day warranty", I was told Lifetime when I ordered them.
I'll be digging through my emails to see if I actually have this documented.
The 5100's are Lifetime warranty.
Bilstein does not cover cosmetic issues on any products.
http://www.bilsteinus.com/products/search-service/warranty.html
I only have the fronts installed right now. No problems with them and I like how they ride but it's the lifetime warranty that got me to spend the extra $$$ on them.
I'm not too concerned with how my shocks look, if after a winter or two they show discoloration I'll just paint them. I may paint them anyway, I'm not big on the shiny silver finish they come with, I'm fine with black.