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The exhaust system must be hung properly with a exhaust hanger that usually cost around $7 bucks for a univeral type.Most vehicles use at least 2 of them and they are not hard to install. As far as the exhaust being dragged for 20 miles that could be a problem for you.Even though you may think the exhaust is all-right it may not be. The muffler could have broken or bent baffles inside causing a restricted exhaust flow which can create a performance and later major engine issues. Good Luck !