QUOTE(Garold Shaffer @ Feb 4 2014, 03:36 PM)
Simple leak test I do is seal off the end where muffler attaches (some rubber & wood bolted on) Then fill each tube with water. If water leaks out around the shield then they are junk because the tube has cracked inside the shield.
I used rubber stoppers/plugs from Home depot and drilled a hole in one for a valve stem. I too used water but then pressurized each tube with a small bike pump. On the ones I picked up off of Ebay, they were full of small cracks and pinholes and unfortunately were not salvageable
But, I feel that anyone who is going to sell a set of stainless HEs should take the time to test them to avoid the danger/liability of the potential situation where the buyer bolts them on and ends up with carbon monoxide poisoning. Plus, it protects you as the seller and it just makes sense.