I am about fed up with my e-series s-bend pipe. The weld at the canister inlet keeps breaking. I've already sent two of them back and the third one has done it, also. I have all of the proper mounting parts for the WR and it is connected properly. I'm thinking that the r-4 may be less likely to break since it is spring mounted, so I may try one of them. Anybody gone from an e-series w/12 disks to an r-4? Thoughts? White Brothers has been very helpful up to this point, but I don't want to have to send my pipe back every 4 months.