I have two cracks in welds in my Dinan xpipe. The welds broke behind the canisters, behind the first one on one side and behind the second one on the other side.
Dinan has no warranty or backing on the "race only" parts and said they only see this on cars that have been tracked. Huh? Sounds like a real "tuner" approach. Now I'm struggling to find someone in my area to weld stainless steel.