Personally, I think an 8 ft flail is too much for the DK45 and would pass. You could try it if you are ok with the possibility of having to resell it. Some flails take more power than other because of drive train mass. I have had three flails, and still own two of them. I had a 7'6" Ford 907 and my 42 pto hp could barely run it in tall grass it had so much mass. Plus tall grass would wrap jam the heavy duty flails it had. I like my 6' and 5' flails. I will get an 88" at some point to run on my big tractor.