I thought Bilsteins have lifetime warranty
Yeah they do... well, except 5160/8100/8112/5125/5165/8125/9200/9300 - and you have to retain your proof of purchase and they still sort of make it a hassle unless your seller/installer goes to bat for you a little.
Incidentally the Bilstein rear shocks that come with the Mopar lift kit? 5160's... so no lifetime warranty on those.
I really like what Bilstein makes, my wife's car is on Bilsteins, my Ram is on Bilsteins, the 4x4 I just sold is on Bilsteins, prior 4x4 was on 'em.. and I have never needed the warranty thankfully because whatever some of these dudes are doing to blow theirs up, I'm apparently just not doing it.
But I also know that if I did need the warranty it wouldn't be worth two squares of used toilet paper. Maybe because too many people abused it or they don't have good enough means of discerning between true abuse or insufficiently well built products to wear a lifetime warranty but either way, warranties that are tough to exercise are useless.