A friend has a DC strut tower bar that he had on a 93 civic, Would it work on my 91 CRX?

 

Yes it would. From what I understand, most sus. pieces are interchangeable between 88-00 civic/crx/delsol and 90-00 acura integra. When I got my SPW strut braces they said on the box 92-00 civic. So I got the horn and called speedpeople.com and said "Hey, you guys sent me the wrong strut braces, I have a 92' Integra and you sent me a braces for a 92-00 Civic!" and the guy at speedpeople said " Well, it should say 88-00 civic and 90-00 integra on the box. All the parts are interchangeable." So unless the DC sports braces are for exact applications only, then it should fit by no means.

 

DC sports list all the bars from year to year different. Try their sight.