Only ever did it for scruitaneering if you just stick the wool up without the mesh it will blow out,have a try before you go for the noise test wrap the wool into a mesh snowball insert up the pipe after the test it can be removed with a small hook. Any resedue wool left up the pipe will either be blown out or rust away in a matter of days.
Em
road rallying in the good old days. Loved it Em.
