It depends on how hard you push them. I didn't have issues with mine until I was running them at 20 psi tapering to 16 by redline. If you run them conservatively with more taper towards redline, they should last much longer. I think you will probably be good to well over 100,000 miles unless you go FBO+Meth and crank up the boost. Plus if you have waste gate rattle, the turbos will be covered under the 8 yr/82000 miles (I think those numbers are right) extended warranty and you can get them replaced for free.
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