imdoo'n
Active VIP Member
I have found that it doesn't matter if you plug the ends or not. Once you fill it with water and put it in the deep freeze, the water in the smaller part of the pipe will freeze solid first creating their own plugs. Once the larger portion of the pipe starts to freeze the expansion of the ice will remove the dent and split the pipe if not Removed right away. I then put the pipe in the bath tub to thaw. I have never done a sled exhaust but it would work the same way as a bike I'm sure. I have no idea why you would wrap a towel around it??
maybe to save a step in the drying off, after washin in the bathtub:d