I have an older Toyota Dolphin Motorhome and now its breathing like it never has since I've owned it. After the years, things get cobbled together, engine's get changed out, and stuff happens. Needless to say, my exhaust system was in poor repair, and not functioning well at all. But, not no more! Every bend, up and over, back and through, and still there's no loss of diameter anywhere. It's a work of art. I love it. It took most the day, but they got me right in and they cut no corners. Marvelous.