i havent had mine in long enough to tell you, but the only reason the stock ones crack is because of the different cool rates between cylinders. The flex pipe sections allow some movement so the section where the 2 main pipes meet dont get stressed.
if yours doesn't sound bad i'd leave it and save your money for a hedder(rugged ridge,borla ect). i've been running mine with a crack for quite sometime now and it's been quiet as far as exhaust leaks go
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