the muffler is pretty easy to replace. though given the cold weather i opted to go to a local mechanic's shop and had them put on the new one. it takes a bit of pulling/pushing so it's best you pay someone to do it for you. otherwise, there's no welding involved. it's simply removing the clamp and putting the new one on.
good luck.

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.