Bump stops or no bump stops?

[opel racer]

First of all, thank you very much to everyone who has answered my postings- you guys are great and I appreciate all of your knowledge and expertise! For IT use, do you guys use stock rubber bump stops, poly bump stops or no bump stops at all? Also, is it neccessary to use the stock dust caps?
I am looking for a bolt-in IT cage if anyone is looking to get rid of one.

[Knestis]

Check with the manufacturer of your struts for a recommendation and then follow it. Bump rubbers are the last line of defense for your strut internals, if you bottom one out. They effectively (and progressively) increase the spring rate to keep things from crashing together inside the strut.

Kirk

[Eric Parham]

Note that Bilstein front struts have internal bump stops, so we leave out the external ones. In the back, I use rubber.