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With the large walker muffler I can have a normal conversation at highway speeds. But boy do you sure notice other noises in the truck! Nothing I need hearing protection for though. And yes it is a flow through design and it seems built in resionator also. Denny

Not much at all, I welded a bracket to the body of the muffler to fit to the one on the truck with the holes drilled in it and legnthened the bracket for the upper mirror rod on the cowl. All in all it took me about an hour to make all the pieces paint and install. I wish I had a camera to take...

I went with the large walker muffler and I love it! No noticable loss of power, can have a conversation with someone going down the road and I can still hear the wistle from mu turbocharger spooling up.:jumpin: Next to grooving my ndtcc tires for snow it is my favorite improvement. Denny