The original Honda exhausts used to have (still may have, but I have had no need to look ) a 'spring loaded ball and socket joint' to allow exhaust to flex and not stress the welds, but cheap and cheerful aftermarket ones tend to get a much simpler flat flange and a bit of exhaust putty and bolted up tightly, so they can't flex and normally fail just after the 18 / 24 month guarantee runs out. The original exhausts easily last 10+ years, maybe less on low annual cars where the exhaust gasses condense in the exhaust and never get hot enough to dry out, so they rot from the inside. It is not a bad idea to drill a small small hole (no larger than 3mm ) at lowest point of exhaust boxes to allow any condensed acidic water to get blown out.