You will see many opinions on wether you need to install bumpstops. Some will say that if you don't rub your tires on your flairs - that you do not need them.
Proper bumpstops help protect from completely compressing your coils. Completely compressing your springs will def shorten thier life and eventually ruin them. Some people will advise you that it does not matter, because they are doing it (or thier friend told them they were doing it). It is
about more than how your tires stuff or what someone has gotten by with.
It's all about choices. Some are good, then again some not so good. Do what you feel is best for you and your rig. I would run the bumpstops.